Thanks for your answer, and information you provided. At the begining I have to make a correction. My happiness last for a day or two, after that the problems with gnome, web-browsers, totem came back (maybe after reboot ? I don't know yet..). I found some more verbose error message from totem saying something about dbus and network connection error. I experience similiar problems with pure testing (fresh install, withoud mixing packages) and mixed testing+unstable and experimental gnome. I didn't try pure unstable release yet.
The "unstable" debian distribution name I think could be wrongly interpreted. "..the first stage of public testing.." sounds a little better, maybe it could be a good system for me ? Nobody want's to have something unstable installed. "Ubuntu" sounds good - there is no negative meaning, it could convince people to use it although it contains almost the same software as debian unstable, as you said. But in fact, isn't it true that ubuntu success (1st place according to distrowatch.com) is also success of debian ? But does debian development proft from that ? Maybe it could do something similiar as ubuntu - release system for desktop users with quite up-to-date software allowing wider testing or take something back from testing ubuntu results ? These are just some ideas, I don't say these are recipes for success. I think debian should notice ubuntu success and could infer to improve it's development. It could make conditions to get more pepole use it and like it (and maybe even love it). Best regards Radek