Joost co-founder Niklas Zennström says more than a million people have signed up to beta test Joost. The service is still invitation only, but a few months ago Joost removed restrictions on how many invitations users could send out.

Of course, having 1 million registered users doesn't mean there are that many people using the P2P video application on a daily basis. Shortly after the company launched its unlimited invitation phase, Joost's servers were hammered by increased traffic, a problem which has since been fixed. But it'll be interesting to see what happens when the service launches publicly. Zennström says that could happen by the end of the year.