The latest Joost beta (0.9) is available for download – for both Mac OS X and Windows. Along with the software comes a few Beta invites… Some are already spoken for, but go ahead and leave a comment if you’d like one. If I can’t help you now, I may be able to help you later. Though, given this version number, it looks like we must be getting close to launch.
Update: Chris Tew of Web TV Wire has graciously agreed to donate a few of his invites. And I’m still working some other angles to secure more…