Yesterday I came across Zattoo which is a really cool p2p live-tv service. A bit the same concept as Joost, but with zattoo it's not on demand. Instead you get high-quality streaming of live channels..And quite a lot already! It's easy to get started and it work surprisingly well.
I'll definetly remember that I have it installed next time my wife wants to watch "America's next top model" when I wanna watch the news!
Speaking of news and online TV, I've already become a regular viewer of DR Update (sorry, danish only news). Good quality and nice to see news-videos produced specificly to the web. Way to go DR!