We found these sites useful
UK and Ireland Genealogy - GENUKI - got us off to a good start.
Census information - all you need to know about UK censuses from British Genealogy.com
Registration Districts - a page within GENUKI, but I think it is worth bookmarking it separately.
Custom Search IGI Page easy to use and invaluable
Rootsweb - part of Ancestry.com but free and loads of people willing to share their research
Ancestry.co.uk - large searchable data collection, requires subscription
Ancestry collection - Court, Government & Criminal Records
Ancestry collection - Birth, Marriage & Death Records
Ancestry collection - Military Records
Find My Past - Extensive collection of useful databases; requires subscription or pay as you go credits
The Genealogist lots of indexes and databases, requires subscription
Worldwide Genealogy - loads of links on this site from New Zealand
Geography of family names - from Spacial-Literacy.org
Genealogy guide - part of the guides network, useful for beginners
The Origins Network - for British and Irish genealogy. Needs subscription; some overlap with ancestry.co.uk but some different databases and alternative search engines. Good for researching ancestors from London area
CuriousFox - organised by location or name. Information exchange for those researching UK and Irish genealogy. Can be used with or (more limited) without subscription.
The Bradbury Site - contains popular message board run by a Bradbury expert.
Wishful Thinking's GENUKI pages - Memorial inscriptions and photos from parishes around the UK
Staffordshire Past Track - cultural identity and social history of Staffordshire
A Vision of Britain through Time land use and social trends in Britain