Pierre’s Posterous

Go to gomockingbird.com (it'll take about a minute to load) and then go to "Save->Save as..." put in anything for the project name. It'll ask you to "Login or Register". Type in your email address and as soon as you tab into the password field it will recognize that you aren't a user and then change into a "register" dialog. Really sharp.

Not only are they using the whole "try before you buy" strategy, but the "buy" (i.e. signup) part is done really well. Really smart use of AJAX.

Also the product itself is fantastic. Mocked up my current little project's UI in about 5 minutes. Very responsive and easy to use.

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