How is the Dreamcast retro if the PSX isn't? Dreamcast is a current generation system (unless you are of the mind that we are in the xbox360/ps3/revolution gen right now) and psx is a generation earlier than it....
Sorry to hijack a thread but....
It's quite possible to argue all day about whats retro and what isn't. The fact is although the PSX belongs to the age of the N64 and the Saturn, it is still a big selling format worldwide whereas those other 2 formats are long gone.
In the UK, PSX stuff can still widely be bought in virtually any games retailer - you certainly don't have to hunt for it and you can still buy a brand new machine anytime you want one.
In comparison Sega pulled the plug on the dreamcast years ago now. They only sell reconditioned units in small numbers and dreamcast games and novelty controllers are becoming the stuff of retro collections everywhere.
But more importantly - I expect our friends at gamestation have to make room for all the Xbox360 stuff, so I guess they moved the lowest selling format into the retro section. (I hope the gamecube doesn't get moved there too or I won't own a single current console.)