Visa Signature cardmembers can register for instant Hilton HHonors Gold membership through August 31, 2011. After promotion registration just complete three stays at any Hilton brand hotel worldwide by August 31 and pay with a Visa Signature card to retain HHonors Gold elite through March 31, 2013.
Current HHonors Gold and Diamond members receive 5,000 points for Visa Signature card registration.
FlyerTalk members report this offer works with many airline and hotel credit cards besides HHonors Visa such as Alaska Airlines, American Airlines, British Airways, Hyatt Gold Passport, Marriott Rewards, Priority Club, and Canada Infinite Visa. Here is the HHonors Gold elite Visa Signature thread on Milepoint.com.
HHonors Gold elite includes complimentary high-speed internet, 25% bonus points and possibly hotel lounge benefits. Benefits vary by Hilton brand. Here is the link for HHonors Gold benefits.