Well I've now got my PS3 and it does play the original games, not very good graphics but they are old games so I'm not worried. I've also got a few PS3 games and they're great. Thanks everyone for your input. ;o)
The original fat PS3 models played PS2 games but none of the slims will as Sony removed backwards compatibility (supposedly) to keep hardware costs down. I didn't know they could play PS1 games, so that's good to know.