I just finished Braid, a brilliantly ingenious game for its story, music, theme, game play - the works.
You can find it lying around on the internet for about 100mb, and about 5 hours of your time to finish. Incredibly worth it, I'd have to rank it as my #1 game of all time.
On another note, 100th post next time. I might redecorate to suit the times.