what i've discovered so far:

1. there are a lot of italian tvs streaming on the web
2. almost all of them is either from rai group (state tv, berlusconi controlled) or mediaset group (berlusconi owned)
3. the rai streamings has several restrictions to be "hacked":
3.1 they check for your ip if its from italy you can stream otherwise not;
3.2 they chek if you're streaming from silverlight and block you if your not;
3.2.1 that block once it was easily workarounded with user agent changing
(in vlc, user agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.0.6) Gecko/2009020911 Ubuntu/8.10 (intrepid) Firefox/3.0.6)
3.2.2 now its even more difficult because you got to use a non-standard http header in order to pretend to be using it; using vlc in ubuntu, from terminal: (wget --header="viaurl: www.rai.tv" [here the strean URL] -O - | vlc --http-user-agent="Linux" -)
4. the mediaset streaming used to be without restrictions till some days ago, now is reported to be checking for silverlight as well (maybe not for your country; maybe its not true, maybe they simply removed them).
4.1 mediaset streamings are not working by simply changing the vlc user agents, maybe they check for the header too and at the moment i dont have a linux box at hand and cant check for it. im not able to change the header from this xp machine im typing from.
5. so the problem is bigger i guess: we should not only find a way to change mplayer user agent but also how to put a non-standard http header on it.
6. there's a way to run vlc on the n900, maybe inside a debian chroot as per iceweasel and open office? then it would be easier i guess.

thats what i know at the moment. ill try to investigate about it some more. sorry for the casual ******** i could have said, im a linux noob and my english is awful.

these are my sources on this matter:

http://flavio.tordini.org/dirette-ra...ht-o-moonlight

http://www.mambro.it/guardare-i-cana...a-silverlight/

http://www.maemoitalia.com/guarda-la...uo-nokia-n900/

http://wiki.multimedia.cx/index.php?title=MPlayer_FAQ

there you will find also the link for it tv streamings.

thank you again!