42" Insignia brand plasma bought this summer (from Bestbuy). It is the exact same model as a Samsung apparently, but it is the Bestbuy private label brand.
You can feel the heat coming from it, but it doesn't need auxiliary a/c. Power consumption is usually 70-100 watts which is slightly more than my old 21" CRT computer monitor consumed.
Picture quality is unbelievable for a $400 tv ($500 now it looks like). It is 720p and not 1080p, but we don't care since it is only 42" and we are not videophiles. Plays standard def stuff really well and looks good (almost HD). Basic otherwise, but you get what you pay for.
I was biased against plasmas for some reason, but now that I own it I'm not sure why. The picture quality was the best I could find at bestbuy for less than $1000 or so in the 42" size. I would not hesitate to recommend plasma to anyone. Just read reviews of the actual tv you are looking at, and take a peak at it in the store before buying if you can, because I noticed a huge difference in picture quality between different tvs, and there was only a very loose correlation with price.