13 Days in Hell

http://13-days-in-hell.freeonlinegames.com/

Yay, more zombies !
and this time you can head/waist/whatever shoot them :D
Having to buy your ammunition adds some additional challenge to the game and rewards a good aim and cool hand even in the most wicked situations more then any points given ^^
And it saves your progress, always a big plus.

BOXHEAD: The Zombie Wars

http://www.boxhead.seantcooper.com/Boxhead_TheZombieWars.aspx

Jon Bambo is alone. Ok not that alone,  by his side his trusty pistol, shotgun, turrets and other tools crafted to put those hordes of zombies to pieces.
Nice top down survivel shooter with many, many zombies to kill.
Every few kill multipliers you get upgrades for your guns and your base placements.

So thousends of zkp (zombie kills per minute), a minigun and a nuclear airstrike, what else do we need to be happy ?*

*ok, i heard  someone shout "boobs", maybe in the next version ? :P

ElectroCity

http://electrocity.co.nz/

That game rocks. ElectroCity is a flash game where you develop your own city in New Zealand. It focuses on managing energy policies, building up power plants and taking care of the environment (in a good way thee hee ;) ).

Sadly I couldn't submit my city since it seems to be only for teachers and students.

Dolphin Olympics 2

http://www.kongregate.com/games/arawkins/dolphin-olympics-2

Score as many points as possible in 2 minutes by swimming and flipping your dolphin. Successful jumps build speed, allowing for bigger and better tricks!
I've played it for over an hour and it's still fun. Try to reach the sun, moon, stars and galaxys like me. Simple but addictive game!

Sentinels of Mijil

http://www.addictinggames.com/sentinelsofmijil.html

Maneuver a small spacecraft and kill waves of enemies. Sounds simple? It is, but this game comes with a unique art style, cool weapon upgrades, smooth gameplay and all kinds of new enemies on higher levels (teleporting ones, seekers, enemy spawners etc.).

Bejewled

http://www.flash-games.org.uk/files/Bejeweled.php

Bejewled is a classic. The objective of this game is to swap one gem with an adjacent gem to form a horizontal or vertical chain of three or more gems. It is rumored to be the most addictive flash game ever. Fact is that it's one of the first widely acclaimed flash games and was released in 2001.

The game was a huge success for PopCap; more than 10 million copies of Bejeweled have been sold, and the game has been downloaded more than 150 million times.

Dead Frontier

Main website:
http://www.deadfrontier.com

Night 1:
http://www.deadfrontier.com/nightone.php

Night 2:
http://www.deadfrontier.com/nighttwo.php

Night 3:
http://www.deadfrontier.com/nightthree.php

The zombie mini games are just a demonstration of an upcoming free Zombie MMORPG which is planned to be released in the first half of 2008.
If they final game is as action packed as the mini games, it's destined to rock your browser.
I think night 3 is by far the best of the trilogy. The whole idea reminds me a lot of the upcoming Left 4 Dead, another awesome zombie survival game.

Sad but true: There was a pretty bad glitch for me in the first night minigame, where after a while I couldn't control the mouse cursor the way I wanted to. Maybe it's a feature that shows just how paralyzed you are once you've been bitten? ;)

Ant City

http://www.freewebarcade.com/game/ant-city/

With the world's largest magnifing glass gone missing there is but one hero to stop evil from... wait a second, you're the one with the stolen magnifying glass! And hey, you can look at people! Side effects might include instant desintegration.

Whatever it is it's evil, but also much fun. Hehe.

Tontie

http://www.eyezmaze.com/eyezblog_en/blog/2004/05/tontie_ver1.html

So addictive i nearly forgot to take a screenshot, after starting it just for that reason ^^'
The only protection is you cognitive system and your reflexes surrendering at 4am.

And oh the glorious music

Protector

http://www.kongregate.com/games/undefined/protector

Yet another Tower Defence game. But if it has to be the same old game again then i want mine beefed up and pimped out.
This one features quite nice graphics, a kinda non linear campaign. Your mages (instead of turrets) gain XP and you can choose between two paths (specialist and  generalist).
With every succesfully finished level you earn a skillpoint which can be used to unlock advanced units and other stuff.
And it gets quite challenging, which is a good thing as i tend to to go back to work after failing,  which is the last good thing, you can always continue at the point you left.

Shift

http://www.kongregate.com/games/ArmorGames/shift

Nice simple puzzle game.

I like it how my brain needs a few minutes to 
adjust so i can see the solution without constantly switching. 

Plus it's black and white, thus art :P

MSOIDS

http://www.crazymonkeygames.com/MSOIDS.html

Done in MSatanicPaint.
Music from the pandemonium itself.
More leathal than razor sharp glass splinters parked right in your eyes.
Not your average flash game.

Ultimate Defense

http://www.crazymonkeygames.com/Ultimate-Defense.html

Another (tower) defense game, but this one actually looks good! But does it hold up in gameplay as well? It does. The only drawback is when at later stages a lame end-boss enemy is crawling through the level at snail speed and you don't have the means to end him.

5 Differences

http://www.kongregate.com/games/Ivory/5-differences

Self-test if you haven't gone blind! ;P
Wonderfully animated "spot the differences" game, definitely worth a try. Hell it's addicitve as well!

Armadillo Knight 1-3

http://www.freewebarcade.com/game/armadillo-knight/

http://www.freewebarcade.com/game/armadillo-knight-2/

http://www.freewebarcade.com/game/armadillo-knight-3/

In the first game you play Gallan, the armadillo knight. You start out slashing your way through hordes of evil besieging monsters to free the town of Serenity.

The second game takes you to the Wara Woods. Help Gallan uncover the dark mysteries of the forest.

In the third installment you can choose to play as either Milo or Gallan right from the start. There's a snowboard as well, weeee! :D

Well I have to admit I didn't play the game long enough to tell whether it's more good than bad, but the visual style is very cute :)
The games might be a bit boring at the start, but they'll get more interesting lateron, plus you'll get a cute crossbow weapon for your cute character as well in part 1 and 2 (dunno about 3). The "jump" parts of the game can be pretty frustrating, if you want to know what I mean check out part 2.

The Last Stand

http://armorgames.com/play/269/the-last-stand

A horror survival game in flash. Try to stay alive, in the night, while blood thirsty zombies try to chew off your limbs. Once you managed to survive a night, you can plan how to spend your daytime hours: Repair your barricade, search for weapons or search for survivors. Can you survive 20 nights of horror?
What are you waiting for, enjoy the cool visuals and intense bloodba... gameplay! XD

Hint: If you're searching for weapons long enough, you'll find a Barrett Rifle ;)

Desktop Tower Defense

http://www.handdrawngames.com/DesktopTD/game.asp

Tower Defense or short TD is a subgenre of strategy games and its gameplay mechanism was based on a series of maps for StarCraft called the Turret Defense.

In this flash adaption, Desktop TD, the player has to stop invaders from crossing through the player's fortress. The player can buy turrets that kill the invaders and set them up in a maze to optimize his defense tactics.

The game seems to be updated frequently, so be sure to check back once in a while!

Mansion Impossible

http://www.donpixel.com/play.php/en/051006012009/

Buy houses while they are still cheap and sell them again at high prices to make profit. The final goal of the game is to make enough money to buy the 10 Million Pound mansion.

There are so many different versions of this game around, I wonder which one is the original. Most of them have different sponsor logos, but essentially they're all the same, at least for me.