To clarify...you've been using an HTC Droid Eris, and now you will be using a Motorola Droid?
If so, what kind of advice are you looking for? Apps? Cool things to do with it?
If that also is the case, you are in the write spot. Carve out a few hours and start reading. There is a specific forum here for Moto Droid, which you just posted in. There is also another forum that I have found helpful,
Droid Forum - Covering all Verizon Droid Phones & the Motorola Droid.
Good luck.