Here is my 2 cents on plasma. Burn in used to be a real problem with plasmas but it has come along way. With new plasmas, as long as you baby it (keep the contrast to about 50% and try to watch full screen hd stuff) for the first 100-150 hrs. of use, the worst you would get is an image retention. It looks like burn in but it goes away. Most if not all newer plasmas will have a feature that shifts the pixels slightly so that static images won't be retained. I imagine that burn in has really hurt the sales of plasmas over the years, it's just one of those things that sounds so bad, kinda like RROD. Earlier this year I decided that I was going to get an HDTV but wasn't completely sold on one technology so I did a decent amount of internet research. I went with plasma because just about everywhere I looked, it seemed like it was common knowledge that plasmas offer better picture quality. More accurate colors, better blacks for contrast, less motion blur and just overall more realistic images. Sounded good to me since I didn't plan on using my panel for just gaming or a computer monitor. I was thinking sports, movies and gaming. I can say that after 8 months my 46" Panny 1080 plasma is the shit, I swear viewing some content just looks incredible especially Blu-Ray. As far as why there are so many LCDs in Best Buy, I think it has something to do with the way LCDs are manufactured vs. plasma and there being more of a profit to be made with LCD.
This best buy deal is a good one indeed, especially for someone looking to break into the HDTV world. Like someone else said the TV alone is $600 which is a decent value to begin with. Hell even if you didn't want the 360 you could sell it and have a new TV.
To anyone who may be thinking of getting a plasma but is unsure of the technology, just do a little research and if you want, PM me and I'll give some links.

Doh I was checking the Best Buy site to compare and it turns out they don't even list anymore any 40" LCD TV with 720p.
All their LCDs are 1080p...

They still have a bunch of 720p plasma though.
Could it be that making 1080p is cheaper in LCD than Plasma ???

It depends as much of the distance at which you are viewing the Tv as off the size of the TV......

I guess there are like 5 PS3 games for you to play... My suggestion is to get a gaming PC, you'll cope better.

They are

PS3 + 46" Bravia = $958

sry i don't want to be rude but point A is bullshit. i had my plasma for 2 months and no burn ins you guys only read articles on the internet right. its my gaming tv so i do alot of gaming and no signs of burn ins. picture qaulity is better than LCD in terms of realism but LCD looks more colorful like purple showing as almost blue in color thats why people wsay LCD>plasma when in realism plasma>LCD. i have a 42 inch panasonic plasma and 42 inch LG LCD so i can compare both.

So much ignorance on this thread posted by people who have obviously never owned a plasma. As some other more informed people have posted, the difference between 720p and 1080p on a 42" screen at normal viewing distance is minimal (ie. you won't notice). What you are more likely to notice is motion blur on an LCD. I've read reports about the perceived resolution of LCDs and plasmas when handling motion and the LCD's suffer from this much more than plasmas. Surely everyone who has seen an LCD can vouch for this as well. They are getting better with higher refresh rates but still can't compare to plasmas. Also, LCDs can't compare to plasmas for black level and contrast and therefore all colours look better on a decent plasma. Go to any AV site and see what the enthusiasts consider the better option for giving the best picture: it isn't LCD. Before anyone asks, I also own an lcd monitor for my computer so I know the pros and cons of both.

Don't want to be rude but... read what I said "reduce the chances" there is always a chance to get them... just turns out you were lucky. Do you play any games and just leave the game on the same picture for a couple of hours? I doubt it.

no i don't keep the same picture for hours on my plasma ussaully 15 mins mx but 3 or 4 times for 30-45 mins. same thing with my LG LCD why would i turn my plasma on and put a picture or pause in halo for 1-2 hours 15-30 mins is it then i ussaully continue to play or close my xbox and plasma.

see... To get burn ins you usually need to keep the same picture on for a reasonably long time with the brightness setting normal - high during the break in period. 3 things. It'll be hard to get a burn in on your tv now after the break in with not having the same picture on your screen for extended period of time.

Have you ever played a ps3 and see it dim after 5 minutes of inactivity?