squarepegs,

Here's an article from Investopedia.com regarding OTC stocks:

http://www.investopedia.com/terms/o/otc.asp

Here are some additional links to sites that discuss OTC stocks. Takes some time to look through them. You'll find some interesting (and hair-raising) articles:

OTC & Penny Stock Basics
http://www.allstocks.com/copia/html/the_basics_of_otcbb.html

A Guide for Beginning Investors of Penny Stocks
http://tinyurl.com/5c2wf

Official Nasdaq OTC BB Site
http://www.otcbb.com/

A Brief Fool Article on OTC Stocks
http://www.fool.com/foolu/askfoolu/2002/askfoolu020712.htm

I think that should keep you busy for awhile. As I'm sure you've heard already, use extreme caution when investing in such issues as they are ripe for fraud and manipulation. Good luck!

Rich