The Borror Laboratory of Bioacoustics
The Cornell Lab of Ornithology's online archive.
bird sounds from around the world
BIRD CALLS and SONGS
A blog about the bird sounds of eastern North America and beyond using original recordings and sonograms.
My bird vocalizations recording blog.
Various nature recordings by Bernhard Kroeger
Very informative blog about bird sounds from Nathan Pieplow.
Lots of useful information, especially concerning Empids.
Naturerecordists Yahoo! Group.
This moderated group is interested in techniques, issues and general discussion of recording natural sounds.