From StarWars.com:
"Show off your Fan Club membership with pride by wearing a Star Wars T-shirt with a design hand-picked by you! StarWarsShop and Hyperspace: The Official Star Wars Fan Club are offering up five distinctive designs for all visitors of StarWars.com to vote upon. You have until Wednesday, December 12th to cast a vote on your favorite design. (One vote per registered member of StarWars.com. No purchase necessary).
The winning design will be produced as a T-shirt to be made available only to Hyperspace members. In addition to the winning artwork, the shirt will feature the Hyperspace logo and the year, 2008, marking it the first as a series of Fan Club shirts made especially for members."
Head over to StarWars.com to see the entries and to vote.