"There is no sign up for Dribbble at this time. Membership is entirely driven by our users - all members of Dribbble have been drafted (invited) by other member

"There is no sign up for Dribbble at this time. Membership is entirely driven by our users - all members of Dribbble have been drafted (invited) by other members." So it's not really the same as Twitter, it's more of an elite collection of select designers showing you pretty stuff. Similar to the way design blogs and their aggregators work now, but this gives it more of an "exclusive, members-only" feel. That said, there's some good design work to be seen. If you're a designer, you should have most of these designers' feeds in your reader of choice already (I'm already following most of the designers I saw listed).