I'm trying to get a sampling of what people think are the best sign-up forms. Good design, usability. Smart engineering. Helpful feedback.
What are some excellent examples of user sign-up forms on the web? [closed]
Surprisingly enough, my all-time favorite, of ones I've encountered in the wild, is Dell's, on their IdeaStorm.
If you click on a control that requires a login (to vote up an idea, for example), it automatically refocuses on the login element. If you don't already have an account you can hit the 'register' tab and no page load is required.
The register form is totally lightweight (four fields I think) and uses AJAX to check if the name is already taken. Once you register you're automatically logged in.
Bottom line, it's visually compact, asks for a minimal amount of information, and lets you login or register without ever leaving the original page.