The search function came up with no matches, so I thought I would let everyone know about a new website I use for plotting routes and downloading them to my Garmin.
I know you can plot a route using google or mapquest, but as a Macintosh user, neither one was very intuitive and user friendly. RWGPS will allow you to plot your route, then (after registering) download your route to your computer and transfer over to your GPS. Very easy on my Mac. Right now I only see Garmin products supported, but Magellan and cell phones may be supported at some point (disclaimer, I haven't investigated other brands other than Garmin).
At first I wasn't sure how to transfer my route, but you can download it as a .gpx file, attach your gps (zumo 550 in my case) via USB cable, then drag and drop the .gpx file into the GPX folder. Disconnect the gps and you are all set.
Very easy and free.