Finally received beta-tester status today, and prompty downloaded and installed Joost.
The good:

Channel Catalog. The main right-hand menu shows thumbnailed tiles of artists and channels.
The interface is very slick looking, very “Web 2.0″.
The chat feature is a good addition to an existing medium which has (until now) always been unidirectional.

The bad:

The quality isn’t very high - […]

As you may or may not know, Joost will be an application to provide the first internet-television service. Ever. It won’t be the first streaming media service, obviously (hi youtube), but in a nutshell it’ll provide users total on-demand content at TV or near-TV quality.
I’m attempting to become a beta tester; I’m excited about the […]