If you're on FetLife, there's a thread there for ride-sharing. I don't think there's one on here, (I looked in the NEST subforum and didn't see one) but you can certainly start one!
For those new folks who are feeling a little overwhelmed about their first gathering or NEST, here is my take on my first gathering. It was NEST 2007. Maybe this will help ease some fears and answer some questions.