afaik, the 2.1 update on the droid isn't rooted yet so you'd need to SBF back to 2.0.1 in order to root. If you're looking for rooted 2.1, you'll need to load one of the custom roms. You can't just load up senseUI on the droid so you have to wait until a rom gets ported. There are some guys over at alldroid working on getting 2.1 with SenseUI ported from the HTC Desire. It works but is in alpha so it's a little buggy.
http://forum.androidcentral.com/motorola-droid-roms-hacks/7317-htc-desire-rom.html