I hummed + harred about this myself... 60gig one does have wifi aswell that the 40gig one hasn't! Ended up with a 40 and i'm happy with it
But at the end of the day i have a PC at home so didn't need the wireless for internet only for the playstation network. I could link up the PS3 to the modem with a 5quid cable which you wouldn't see behind the telly stand anyway...
Got a blinding deal from Blockbusters of all places!!! I got the following...
40gig PS3
2 wireless controllers
Black hawk down on Blue-ray ( I could choose
ANY blue ray film i wanted)
Fifa 08
Motorstorm
Restance of man
DVD remote control
HDMI cable
all for 389.99. I was chuffed!