There is one catch that will trip up a few of us newcomers: Joost is still only for Intel Macs, so our PowerPC brethren are left out in the cold watching TV the old fashioned way-- on a television (and at normal quality with no lag-- whoops, low blow?).
The latest release also adds a few new features, including faster streaming for low bandwith connections (touche), and a few other interface tweaks. Joost is available for free, now to anyone, over on the website.
Thanks to everyone who sent this in!