I'm going to build something like this for the site:
It's a Flash-based tab creator. You click the fretboard to create the tab. When you're done, you highlight the tab and copy it. Then you can paste it into a message (wrap it with PRE tags to force it into that typewriter-style font). Looks dead simple. I'm not sure when I'll get around to it, but we need one, I think.
You guys can actually use this now, if you like. Just don't copy the top two strings (unless you're tabbing for a six string bass).