Can you help how to prioritize some http://www.sites and servers(e.g rapidshare). I am doing that using quee tree(i have here setted up priorities for some services and max. download and upload limits) and mangle(here I am using address list in which I have ip adresses of some server(http://www.youtube.com, http://www.rapidshare.com - but this is very exhausting way of limiting some services because I must get that ip addresses of some sites using torch on some klient). It could be better to write name of some servers(http://www.rapidshare.com) and all ip addresses of all servers of rapidshare com will be limited. I heard that it can be done by proxy, but I have no idea how to use it in routeros(and using mikrotik refference manual hard to understand it). Any idea?

It is not possible to set any mangle rules at proxy, proxy might be used only as HTTP filtering.
There is no general/easy way to get these servers, you need to use addresses that are using by these pages in mangle.

is any other way how to do it beside that using address list and torch, or how do you prioritize watching videos on port 80, openning web pages downloading?(because some time is problem to fing out the web service, when I get ip from torch(itis working in rapidshare and youtube, but not in e.g google.video.com)

look in this topic, we have discussed this today already:
http://forum.mikrotik.com/viewtopic.php?f=2&t=17687

there is a nice solution towards the end

yeah that is very good way