[OT] Good reference for setting up Apache in reverse proxy mode?

[Mike Pelley <mike pelleys com>]

Sorry for the OT post - I'm in a time crunch and need a quick-and-dirty 
reference for setting up Apache in reverse proxy mode.  Basically, I 
need to have the reference for http://www.foo.com go through to the 
reverse proxy to the internal web server.  The internal server is using 
virtual hosts as well.

Thanks!

Mike