yeah ive moved into a flatshare and unfourtunately i moved from a lovely zen 8 meg connection to a shoddy intermittant pipex connection that is supposed to be 8 meg but never reaches anywhere near it.
anywho... as a bit of a benchmark have you tried downloading something very popular (and therefore very available) such as linux iso's? they're a very good way to test out your actual connectivity.
that and i just googled for utorrent tweaks and i got a list as long as my arm of things to do, they all seemed to have helped too - especially the stuff about maximum upload/download bandwidth, number of upload and download torrents, various other bits and pieces... oh and also the xp hack that increases the maximum number of open connections too.
hth.