OK, so this is small but kind of neat. If you enter the URL mail-link: in Safari's address bar, it will tell your default mail client to create a new message with a link to the current page -- just the same as selecting File: Mail Link to This Page. You could put these links on your website for Safari users, or make bookmarks from them...
I'd like to find a list of all other links of this type...
Mac OS X Hints
http://hints.macworld.com/article.php?story=20050802180157513