The second thing I added is a Garmin 60 CSx handheld GPS receiver that my mom's friend lent to me. I'm not too big on gadgets, generally, but it's small and I was able to download the entire AT to it as a track file and all the shelters as waypoints, so that's pretty cool. I'll probably end up using it a lot.
I drove up through the White Mountains (following a snowplow a good part of the way...isn't it spring yet?) and they look pretty intimidating from the car, I can't imagine how they're going to look from the trail!