InviteShare.com is an amazing new website where you can get Pownce, OiNK and Joost invites and more. Sign up and add yourself to the lists of people waiting for invites for the invite-only website of your choice and you should eventually be notified when there’s an invite for you. Share your own invites and you’ll get higher priority for when you need an invite for some site yourself.
You’re welcome. :-)
UPDATE: Wow that was fast. I’m already on Pownce.