Why don't those PlayStation games work on my PS3?
Sony answered the above question after a problem arose with the 1.70 firmware update. See, the update allowed you to download PS-One titles and play them directly from your PS3 instead of generally needing the PSP, but something was wrong. The downloaded games wouldn't work. Oops. Sony answers why that is as we pull out our hair in aggravation.
It seems for the games to play on the PSP, it has to have the ROM itself and a certification key -- the PS3 doesn't need a certification key to play the games, so there's no reason for it. It needs to be removed. Sony is on the case right now and will have everything cleared up "sometime in May". If you downloaded anything, don't worry -- you won't have to pay for the games again. Kind of annoying, but hey. Sony should have thought about that being an issue. Now we have to wait to get our Crash Bandicoot on.
