Finally!  Rumours are running rampant that in an upcoming firmware update for the PS3 will enable PS2 Backwards Compatibility for all models!  Source:http://www.psxextreme.com/ps3-news/5400.html
There's lots of fabulous PS2 games, and generally much cheaper than new PS3 games.  With upscaling, these games look even better than they did on the PS2 itself.