How do I vote in the 2008 Presidential Election?

I moved from PA to NC a month ago. My driver’s license, license plate, and registration will be PA until December. (When I called the DMV, they said the best time to get everything changed is when you’re due for either registration or inspection. For me, that’s December.) So, even though I’m an NC resident now, all my shit will be PA through the 2008 election. Do I register to vote in NC? Is that permitted when I have still have only PA documents? It doesn’t seem like this is an appropriate situation for an absentee ballot because it’s not like I’m only in NC for a period of time and will be going back to PA.