The following are websites I would strongly recommend a visit to if you are interested in birding or nature as a whole.
Birders & Birding
Will’s Adlib Blog – is there anything like this guy? The blog of the living legend that is William Bowell. A unique and mind-expanding experience
Punkbirder – this site has to be visited; some top value stuff on offer
Skill’s Bills – more insanity and laughs from Tom McKinney
British Isles Birding – Richard Bonser's site not only dedicated to birding in the UK but also complete with excellent trip reports
Menziebirding – Liverpool's hot young stuff, Stephen Menzie
Photography
The Wandering Birders – myself and Will Bowell's site with galleries and trip reports.
Kit Day – arguably the best rarity photographer in Britain these days, an unmissable website
Local Birders
Mike Weedon – some tops pics from Mike who appears to have mastered the art of digiscoping
Kevin Durose – once again, superb pics from Peterborough's bird finder extraordinaire
Bird Clubs
Lincs Bird Club - just a word of warning; watch out for intense bitchyness and regular senility
Unmissable Sites
Birdforum - escapes? hybrids? look no further.
Surfbirds - an essential, but seems to be crashing alot at the moment
Rare Bird Alert - does exactly what it says on the tin