Ttalk.info
TD Overflow Pipe Routing
The images shown on this page have been gathered from a few sources and are not original to me. I'll be happy to give credit to their originators if they'll just let me know. I recall that I got these from Ed Kaler of JustBrits and that they are shown his site at http://www.justbrits.com/Articles/pipes.htm
Here's one set: (Sorry, they're not thumbnails, just small images)