US Airways has a promotion out offering up to 18,000 bonus points for just six segments on the Shuttle between Washington, DC, New York City and Boston. The promo is split in two phases, offering 6,000 points for the first three segments and 12,000 more for the next three segments flown. And it includes flights through January 31, 2013.
This is a pretty rich deal, especially considering the off-peak fares for shuttle flights. My first ever mileage run was on the US Airways shuttle back in 2003. Might be time to relive the good old days.