Motorola Droid — List?
created on Aug 26, 2010 10:23:44 AM
Things like these with what they do.
*228 options 1and 2
#832 will restore your apps after a data reset
hold power and x
created on Aug 26, 2010 1:38:14 PM
This link has some interesting functions/abilities that I didn't know about before.
This link from XDA is probably more what you are looking for, with lots of dialer codes that do many things.