Some good reviews and research on these sites:
Plasma TV vs LCD TV - Plasma TV Buying Guide
Plasma TV Buying Guide: Offers Plasma Television, DLP TV and LCD TV Buying Tips
LCD TV Buying Guide: LCD TV Reviews and Buying Advice, Find the Best LCD Television
Personally I prefer plasma, and I'm a Panasonic guy. They're one of the best in the biz when it comes to plasmas. I have a 46 in my living room, and a 37 for my game room. I do have a Vizio LCD for my master bedroom though that I'm pretty happy with too.