US Airways grand slam promo - up to 110,000 bonus miles

US Airways is running a scavenger hunt-style promotion offering up to 110,000 bonus miles for earning miles through all sorts of partner activities (other than flying).  It's actually pretty easy to rack up some bonus points for very little effort.  Four activities gets you 3,000 miles.  Eight gets you 10,000 miles.  What do you need to do?  There are a number of helpful blog posts from Mommy Points, View from the Wing, etc that give you some good ideas.  See the complete rules for details.  My vote for easy "hits" include:

• US Airways Dividend Miles Mall: Buy an e-mailable gift card from Amazon.com for as little as $0.15.
• Restaurant.com: Buy a gift certificate using one of their frequent coupons (use "NEW" for 50% off through today).
• Points.com: Exchange as little as 4 AAdvantage miles for 1 Dividend Mile.
• Hotel point transfers: Transfer 850 Starwood points to 850 Dividend Miles.
• Redeem transferred miles for a magazine: Sunset magazine for 400 Dividend Miles