No. You can use a mouse and keyboard on the PS3 for browsing and whatnot, but as far as I know, not for gaming.
I really dont see the point of keyboard and mouse on a console, it limits to were you can sit and play, which is one of the positives when owning a console.
Last night I switched on my Xbox....
To my horror it was showing the RROD
I then unplugged the power and waited about 10 min, after which I reconnected it and it was working fine. Should I be worried?
Rock and Roll aint noise pollution