For anyone interested in getting to know more about UK Broadband, how it works, terminology and a raft of associated topics - kitz.co.uk is definitely worth a visit with a pot of coffee, and a hour's worth of nosing around the Site. Its one of those Sites where most pages need a second look else you miss useful links and test links.
There is a lot of ADSL information going into considerable depth, including how good your line is re signal noise, expected speeds with your signal to noise ratio etc etc etc.
A similarly useful, if not so in depth section on Routers.
A very good active Forum.
Kitz - UK Broadband Information Site
Regards
Zy