[Blasterpez]

here are a couple sites i found using that new fangled interweb thing...hope they help:

Loudspeakers

Science Project: ESL electrostatic stereo speakers (these are electrostatic speakers...but it tells you how to build them, and it was someone's science project)

Quarter Wavelength Loudspeaker Design

you know, it was kind of hard to find a website that spoke about speakers, rather then trying to sell them or review them. not sure if any of those are any good. but that firs site there looks promising.