1,500 Free US Airways Miles for New Members
Get 1,500 free miles for signing up for a Dividend Miles account (see details here). Join by September 30, 2010, so act soon!
They are also running a Grand Slam promotion, which encourages partner activity. My analysis of the promotion is coming shortly, so if you want to bank some US miles (one of the more valuable frequent flyer mile currencies), sign up for an account now.