Searched for a thread like this, I did not find it, so... One thread to post them all. One thread to find them all. One thread to bind them all. And, when bored, play them. And since the euro is on: http://www.goalexpress.com/sports-heads-football-championship-2/
http://www.kongregate.com/games/FliplineStudios/papas-wingeria Also has pizza, taco, ice cream, etc etc etc types as well.
Gemcraft is ridiculous. Ridiculously amazing that is. Also I'd recommend another game but i forgot the name, involves programming the guy to light up blocks. And Sonny, don't forget to at least give Sonny a sporting chance.
This game is awesome, just played a season, came second. Really addictive. Think I will play some more when I get home from work
Pandemic is great. FYI iphone and probably android users - Plague Inc. Fairly good app version (although a little easy tbh) and yes.......madagascar is still a bitch. For Tower Defense the best I have played are easily Gemcraft (preferable 2 or 'Chapter Zero' as it's called) and Bloons. Boomerang throwing ninja monkeys! Nuff said. If you have steam or xbox live though you really should try Defense Grid: The Awakening. Just have a blast on the demo to see if you like it.
^ Chrome, so much win! Love it! Another quite fun game would have to be that fast food empire simulator. I forgot the name, but it's pretty fun. Also Madness Combat is a pretty fun shooter. Well designed too.