Over on the United forum, we're wondering why there's not been a thread started about this here...
I just saw email from US announcing DEQM (and double redeemable miles):
Get a jumpstart with double miles this spring*
Dividend Miles Jumpstart
Did we say double miles? We meant double miles that count toward Preferred status, and of course double miles toward award travel. All you have to do is register, book your trip and travel between April 13 and June 15, 2010.
The T&Cs are only on the website:
*Terms & conditions: You must register, book and travel between April 13 and June 15, 2010. You must register before you ticket your reservation to be eligible. Not combinable with any other offer. Jumpstart promotional miles count towards Preferred status. Bonus miles are applied to the base miles earned and do not reflect a class of service, Preferred flight or any other bonus. Flights must be operated by US Airways, US Airways Express and US Airways Shuttle. Please allow up to 2 weeks for bonus miles to be credited to your account. All Dividend Miles terms and conditions apply.
Registration Link
The promo code appears to be JS10.