It seems some other people are also working on ways to watch TV on the N800 using Myth TV:
Using a program called GMyth :

http://gmyth.sourceforge.net

Here is a cool video:

http://labs.morpheuz.eng.br/blog/04/...r-your-videos/

And it seems somebody has also had luck using MP4 encoding and VLC (that didn't work for me):
http://www.oliverbrown.me.uk/2007/01...the-nokia-770/

I' looking forward to Gmyth and a bit more detailed (=simple) installation instructions
But for now it seems that Orb 1.0 and the normal media player is the best working sollution for streaming live TV to the N800.

BTW. I also tested Orb 2.0 again, It does work (the Real media output is best). But sometimes the streams keeps stopping and buffering no matter the bitrate. (I did not have this using Orb 1.0)
I wasn't able to get the UPNP option of Orb 2.0 working for video using the N800 media streamer. And Also the build in flash player doesn't work well ( only the low quality flash player works and that is FAR worse than the Real output)

So I'm using Orb 1.0 for now (most extra Orb 2.0 features either don't work on the N800 or I don't use them)