Since the PS3 section looks dead, I'll try my luck here.
I wanted to know if it was possible to sign up another PSN account for my user ID since my brother has signed in the PSN account for his user ID. I was told by a friend that it was only 1 PSN Acc per PS3?
You can have several PSN accounts on a PS3, you just need a separate user account for each.
Ah thanks for the response, tried it out already.