iSpot! Learn more about wildlife, share your observations with a friendly community and get help identifying what you have seen.
Bird song identifier / recordings www.xeno-canto.org plus code to embed the recording in your blog posts.
BTO Videos a collection of youtube videos on how to identify birds, the good thing about these is they show you how to tell the difference between easy to confuse species.
Wild Flower Identification
Flower guide A colour-coded guide to the 65 species in the Plant Life Common Plant Survey (pdf)
Identify wild flowers – Botanical Society of the British Isles
British Lichens Fantastic site for identification go to Picture Index
Insects and Spiders
Steven Falk has probably the best online insect photographic collection www.flickr.com/photos/63075200@N07/collections
BioImages The virtual field-guide (UK)
Not the most user friendly but very comprehensive and a fantastic resource.
iPhone and iPod touch apps,
Isoperla Apps for Tree identification, Bird identification and Bird Song identification plus Orchid and amphibian identification.