Samknows.com is dedicated to tracking the roll out and progress of broadband across the UK. Detailed information on the coverage of nearly every broadband network operator in the country.
Very useful set of pages where there is an up to date status page for the important UK Internet Service Providers.
A UK based ADSL speed test that's given me accurate results.
The link below directs you to a Broadband Availability Checker, to see if broadband is available on any telephone line, and to tell you the maximum speed available on it.
The Virgin Media (formerly Telewest Blueyonder) Service Status page
Query the RIPE Whois Database.
Turn an IP into a name and address.
