Might need to fund account to get bonus miles
Opened a "regular" account for my wife and myself on 09-21-2011.
Since no points posted, I funded both on 09-26-2011.
Today (09-28-2011) the following posted for both accounts:
9/26/2011 09/27/11 SHAREBUILDER REGISTRATION MILES 2,500
So, at least in our case, it seems that a first time Sharebuilder "regular" account might need to be funded in order to get the 2500 miles bonus.