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Joost invites are available for a short time at Ars Technica.

"What’s Joost?", you ask? From the Joost website:

Joost is a new way of watching TV on the internet. With Joost, you get all the things you love about TV, including a high-quality full-screen picture, hundreds of full-length shows and easy channel-flipping.

I’m not even sure if Joost is any good, but I got my free invite so I can check it out. Get them while you can!