LINK
IBD note: The link was found on the website of First Tech Credit Union. I am not sure if you have to be a First Tech member to get the bonus. I do not see anything said about it in the ShareBuilder terms (see below).
Terms:
You must open a new ShareBuilder Account and complete a stock purchase to receive the $50 bonus offer. Please note the $50 credit will post to your account approximately 4-6 weeks after the first transaction executes. Cash offer available for Individual, Joint and Custodial accounts. You must have U.S. Tax I.D. (Social Security Number) to open a ShareBuilder Account. Limit one promotional award per unique customer or custodial beneficiary. The $50 offer is not valid with IRA or Education Savings Accounts. Not valid with any other offers and expires 1/15/08.
