I have 50 twine invites, my crossposting has made it so I’ve jumped through hoops across multiple networks giving out my last bunch. So here is what you have to do – you have to go to creeva.com and post a comment on this thread there. The URL is http://creeva.com/2008/06/10/50-twine-invites-available/
Make sure you include your real e-mail address in the proper field (which is hidden and I won’t share) so I have an address I can send the invite to. The first 50 people get invites. You don’t have to leave your e-mail address in the comment body.
To learn more about Twine take the overview tour.