I'm a Six Sigma Green Belt, I've done tons of process maps.
Incidentally, do you know of any firms hiring into their LSS or process engineering groups in the DC area?  Mine doesn't do nearly enough of that work to keep me staffed on such projects 
 
If you're using Visio 2007, in the templates, go to Business, and choose the TQM diagram.  Choose shapes, type in the box, and connect them.  Most people don't even know what the different shapes mean, so use rectangles for process steps, diamonds for decisions, and circles for start/stop if its a simple process.  Most people seem to get that when they read it.