simple electret microphone.
http://www.atempo.dk/mic/
Home made.
http://www.minidisc.org/homemade_mics.html
http://www.zen22142.zen.co.uk/Circuits/Audio/dyn_mic/dyn_mic.htm
Making a Rugged, Connectorized Microphone From a Panasonic Microphone Capsule.
http://www.libinst.com/micassem.htm
http://www.dact.com/html/passive_preamp.html
describes one passive preamplifier design and some tube based preamplifier designs.
http://www.users.globalnet.co.uk/~valveamp/LinePreProject.htm
that separate voice from noise.
http://www.edn.com/archives/1994/062394/13di4.htm
simple preamplifier with phantom power supply
http://www.nomad.ee/micros/preamp1.html