There's been some confusion about all the various PS3 models that are available. Sony has introduced, and discontinued, so many different SKUs over the PS3's relatively short lifespan so far. Did you know, with the discontinuation of the Metal Gear Solid 4 model, there will only be two SKUs on the market? And did you know that neither will have backwards compatibility? Check out Joystiq's handy reference guide to see the stats of each SKU -- and if make sure you've nabbed the system that fits your needs exactly!