http://armorgames.com/play/12141/kingdom-rush
The best tower-defense flash game I've ever played.
Cool - I played the heck out of the Gemcraft games so I'll definitely check this one out.
I've been playing a game I just heard about called "Barkley: Shut up and Jam: Gaiden" It's...uh...different, but really well-done. It's a "sequel to Space Jam" set in the future where basketball is banned because Barkley dunked so hard he started the apocalypse.
It's patterned after the old Super Nintendo Final Fantasy games. So far I've fought the corpse of Kobe Bryant, a cyborg Vince Carter, and Bill Cosby's ghost. And it looks like Jordan's coming up. Good times.
http://www.youtube.com/watch?v=8F1cOvZ3nS8You can download it here for free (note - not a pirate link, this is freeware):
http://games.softpedia.com/get/Freeware-Games/Barkley-Gaiden.shtml