Between the two of us, Dave and I managed to give away over 50 Joost invites and probably sacrificed a couple of hours to the cause. However, GigaOm has managed to find a solution to the difficulty of emailing these puppies out one at a time. Working with Joost, they’ve developed a landing page where all you have to do is fill in your own info for an invite. Problem solved.
Sorry to the folks we didn’t get to in the comment lists. Enjoy your newfound access. But one word of caution, Gizmodo reports that new beta users are inundating the Joost system, causing it to “stumble” rather than “sprint.” Good luck.