you want a custom 2.1 rom or the official vzw 2.1 with root and baseband update?

both can be found on threads over at Droid Forums - Nexus, Motorola, HTC - DroidForums.com in the rom section.

if you are looking for a custom rom, i would suggest going to the market and getting "ROM Manager". It will download and install a number of roms for you (with the paid version. free version only downloads cyanogenmod by default) but of course, you need root access first.