[quote name='iggywiggum']I didn't see this answered, and I'm in a similar situation.
I just bought a PS3 at Circuit City last week, but the disc drive is faulty and won't take in any discs (blue access light flashes, drive makes a buzzing/clicking sound). There's nothing on my system that's irreplaceable, but I don't want to have to start over and make a new PSN ID. Will I be able to keep my current ID and use it on my new system? It seems likely, but a little reassurance would be nice.[/quote]Yes, all the PSN ID is, is a username and PW.
Just make a system ID on your new system, then try to connect online with your original PSN ID and you're set.