Hi Kim!
I've been using a MBP for about a year now. I hate mine. You'll love yours. The new ones come with hardware that is Leopard compatible and run much better. My version has lots of bugs, so I'm upgrading to a Mac Pro here in a few weeks. I'm jealous you're getting a new one!
If you need to know anything, I have become intimate (haha!) with mine and I'll be happy to share!
My first tip is to use Time Machine! Get an external drive and allow Time Machine to back up your files on it. This is a lifesaver and will really come in handy when you're handing tons of files from different clients. It's a scary thing to lose data!
My second tip...check out the forums at
www.macnn.com before installing ANY update. They'll tell you if the update has bugs or not. That has saved my tail many times.
Enjoy your MBP! I'll be around if you need anything!