The site teagames.com has some decent stuff, but it doesn't always work on my computer.

How has this not come up? Tetris Rox!

Awesome little downloadable game! (RayHound, it's called)

Woah, thread necro!

My favorite game is definitely Advance Wars By Web. Its completely browser based and completely free. The best way to find a challenging game of Advance Wars is right here.

Feel free to send me a message sometime if you want to play a game.

*joins the necro*

Don't know if this one has been mentioned or not but I've been playing quite a good bit of it over the last few weeks (gradually losing interest now though):
http://kdice.com/

Worth a check.

Looks fun, sort of like risk.

http://intihuatani.usc.edu/cloud/flowing/

flOw - evolve or die.

www.the-reincarnation.com

Playing in the Blitz server, might be nice if we can make a Lusty guild and make it to the top ten.

Neopets can be a fun waste of time. Or puzzle pirates.

Sounds great, I'll go and make a country. I used to play a game like this a few years back, they're very fun and not very demanding at all. (a minute or two each day to guide your nation)

Yeah this games pretty sic and stoopid

They're actually making a downloadable version for the PS3

Argh. Kdice annoys the hell outta me. There's way too much luck involved.

Meh. Looks like a clone of Utopia. Which I should start playing again...

I've watched people get teamed on Kdice to often, and been teamed myself to much, to enjoy it anymore. I love the strategy element, but I've lost with 5 die vs 3 before, that sort of defeats the purpose. Plus, getting crushed before your first turn comes up sucks too.
Actually I signed up and everything and it still won't let me in, maybe I'll try Utopia instead.

Edit:The Reincarnation is working, it just took awhile to confirm via e-mail I think I tried to soon afterward, it's nifty.

www.kingdomofloathing.com (fun and funny)
www.novelconcepts.co.uk/FlashElementTD
www.gprime.net/nanacacrash (I think)
Some game called Chaos Theory
Sinjid - Shadow of the Warrior
Slacker
Slacker 2
MOTAS (escape from a room, etc. - the original, methinks)
Crimson Room (MOTAS ripoff, bit too much random clicking)
Viridian Room (sequel to Crimson Room, see above)

AWESOME GAME, thank you, i played this one maybe a year ago, and then lost the url for it. I've been looking for it since. I didn't remember what it was called though, I kept searching for 'ninja flash games' or something along those lines.