Just a quick update: I've done a little editing over at www.onlinEnglish.net, and now it is possible to access special live video rooms for EACH of the iBT TOEFL speaking tasks on our free sample test. You don't need any software, special memberships, sign-ins or downloads - the live video rooms are available directly in your Internet browser, and linked up to each iBT TOEFL speaking task page. You'll need a web-cam, of course, as well as a microphone, but it's super easy to use.
This is great if you want to meet up with other iBT TOEFL test takers and do some live practice and exchange.
Good luck with it!