Nice, you got a PS3?
Awesome.
Anyway, getting back to your problem . . .
I'm not a networking guru but I might be able to help.
I think that you may just need a crossover cable to hook your laptop to your PS3, and then you can enable the internet connection sharing on your laptop to share the wireless connection with the PS3.
I hope that makes sense.
And by the way, welcome to the forums.