It's no longer on the website, it's now in the actual client. If you have v0.9, click "My Joost" and it should be there, if not click "Widget Menu" and then "Invite Friends".
that was taken from here:
http://www.neowin.net/forum/lofivers...30511-500.html
hope it helps you
would love an invite if you find them in joost
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