the ones i purchased, really. I've always had fun with Uno, and i knew i wanted Geometry Wars and Lumines as soon as i could get them. i was surprised to see Super Puzzle Fighter up there as well, but i didn't pick it up because i still have the original Playstation version somewhere.
of course, free ones like Undertow and Carcassonne were fun for a while as well.
I have a several that I like but Geometry Wars is by far my favorite. Worms was fun for awhile and Street Fighter 2 had me feeling crazy nostalgic. I think Vigilante 8 will be a fun addition to the XBLA. That is, whenever they plan on releasing it. It was rumored to be released back in the Spring.
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