[villageidiot]

There's also a free signup option that they don't publicize:

http://www.experts-exchange.com/registerFree2.jsp

Although I can't think of any reason to use it.

[lucumo]

I have. Signing up is easier than on StackOverflow ;)

Edit: Just checked the link: "Site access is now limited to Premium Service Members."

So, no more free accounts.

[vinc456]

You probably already know this but I wanted to point out that users can participate in a limited way without registering on StackOverfow.

[villageidiot]

Start a new brower session or delete your cookies. You get that message if they recognize you from an existing account. I get that message in Firefox (after signing up from Firefox) but not in Chrome or IE.