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Another similar option is Mailinator: http://mailinator.com/

Some websites block emails from mailinator which is pretty annoying.

I wouldn't call that simpler. You have to register using a fake email, possibly actually go check the inbox and click a link, and possibly be required to log in again now that the account is registered. With bugmenot, all you do is copy and paste a valid username and password.

For Firefox users, made even smoother with: https://addons.mozilla.org/en-us/firefox/addon/bloody-viking...