if you can upgrade to 4GB of Ram...it might pay off in the long run, because new computers are starting to come standard with 4 in them. BUT 2 is definitely nothing to respectable.
but other than that, I'd say Wow. Nice setup.
The Core Duo processer is impressive, if you haven't used one before (since they're relatively new), you're gonna fall in love. especially with 2.66GH, I've got 2 in my notebook, and it's quick as hell.
I know you won't have any trouble, so have fun!
Just one question, what are you upgrading from? I'd like to know how far of a jump your taking from your old computer.