I just got emails to sign up with E-miles for Delta and Priority Club.
From the FAQs it looks like there are a few new partners since the last time I have visited the site.
You can earn e-Miles miles to be deposited into your frequent flyer or sponsor account with Delta Air Lines®, US Airways®, United®, AirTran Airways®, Hilton HHonors®, Priority Club® Rewards, Frontier Airlines, Alaska Airlines® or Amazon.com Gift Card*.
Priority Club gets about 1.5 PC Points for each e-mile.