I submitted a tip on how to create a blank email message button by drag-and-drop a "mailto:" link to a folder or dock. Well I got bored and decided to play around some more with mailto links. And I found some neat stuff you can pull of with mailto: links:
mailto:foo@bar.com?cc=bill.gates@microsoft.com,[Editor: I had to break that into two lines, so you'll need to recombine it into one before the shortcut will work; I also had to drag it to the desktop and then to the dock; direct dragging to the dock failed in Jaguar.]
steve.jobs@mac.com&subject="Keep a free .Mac option"
Mac OS X Hints
http://hints.macworld.com/article.php?story=20020902084420360