Perfect Dark XBLA Review - Xbox 360 Review at IGN
One of my all-time favorite games, and a reason (til now) that I still have my N64 around. Played a little of the first level this morning, looks great.
If you're a fan of the original, or of its Rare predecessor Goldeneye, then this is a must buy. Can't wait to try out the XBL multi-player modes as well.