The How Stuff Works web site has a featured link on their home page that tells basic stuff about rotary engines and shows some neat pix and a java applet (apparently) of a Mazda RX-7. It mentions the RX-8 and Renesis, too, so it's pretty current.

Here's the link: www.howstuffworks.com/rotary-engine.htm

Check it out...

 

been there. done that.