Markertek

Markertek has a wide variety of specialty recording gear. Unlike the big chain stores, they are more focused on audio for video and so have a lot of useful field recording accessories.

Binaural blog – Solid Silence

http://www.solidsilence.com/

Audio FAQs

FAQs covering many facets of audio: http://www.faqs.org/faqs/AudioFAQ/

Another DIY stealth mic

http://members.aol.com/MicDIYers/main.htm

DIY stealth mics

These are really very similar to the Giant Squid and Core Sound models.

http://www.minidisc.org/homemade_mics.html

Richard Lerman on making contact mics

http://www.west.asu.edu/rlerman/PDF%20Files/Children%20&%20Piezo%20disks.pdf

Hydrophones from Cetacean

http://www.cetaceanresearch.com/hydrophones/index.html

Stealth microphones from Core Sound

http://www.core-sound.com/default.php

Stealth microphones from Giant Squid

http://www.giant-squid-audio-lab.com/

Microphone FAQ

http://www.harmony-central.com/Other/mic-faq.txt