Bunny Must Die ~ Chelsea and the 7Devils. My brother's PC was having some odd problems so I used system restore on it. Fixed the problems, killed my Bunny Must Die game (with all the other games on the PC instead of the external 1TB hard drive like Dead Space 2 and Rosenkreuzstilette) and most of the saved progress. Now I'm afraid that I have to fight those pumpkin bosses in the tower area again for the achievements (and I was right on fighting Halloween Alice, too)..
La-Mulana (PC version). Also died with Bunny Must Die, but I'm making somewhat quick recovery (even though I'm still at the beginning of the game). Strangely, La-Mulana is working better than it did before now that fullscreen mode isn't messing up the colors.
Left 4 Dead 2. Ugh! I want to play this game again with my buddies online. I had some good laughs when we played this, I miss it. I want my Gold membership back...
Rockman 7 FC. Man this is awesome (and free) re-creation of Mega Man 7 in 8-bit glory.
@Sakura Matou:
Not only is the Xbox 360 S (slim) quieter as Vixy pointed out, but if I recall correctly the motherboard on this Xbox 360 has a less RRoD ratio than the original fat Xbox 360. So generally it's a better Xbox 360, I'm glad I didn't bother to get one until now.
Once Dust: Elysian Tail comes out, I can truly say "I have no regrets".I'm definitely adding Half-Minute Hero to my wishlist, this game's fun. ^^
-EDIT-Is playing this.
Sora
Starbreaker(final boss) is just [tornado fang]ing mad bulletmissileflamethrowerbeam spammer and still cant beat it for over 6 hours on normal mode
I hope copies of this game doesn't disappear because I want to actually this game if I ever get to buy doujin PC games. That, or Rockin' Android sells out on Sony and release on PlayStation 3 in English. When will it be Xbox 360 owners' turn to have some doujin games from you guys?!