These two little games are tons of fun:
Karoshi 1
Karoshi 2
(Download link at the end of those initial posts - I don't like messin' with applets or whatever so I played em off my computer.)
Puzzle game - have to kill yourself to clear the puzzles. The first one is a little more straight forward but still cool, but then you get to the sequel and it's just pure awesome (less platform, more puzzle.) You REALLY gotta think out of the box in quite a few of these. Just took a couple of hours to jam through both but there's some cool shit in there.