With all the different versions, each with varying levels of backwards compatibility and the like, it can be confusing for people that want a PS3, and have it be compatible with the games they already have so that they don't have to constantly switch between consoles.

It's the one reason I'm saving up for a Wii and Xbox360. My PS2 is on its last leg since it's purchase on Launch day, and I'll be damned if $900 of games are rendered nothing more than shelf filler.