Here's a cool trick I was unaware of until today. Mac OS X Hints
describes how to email a URL from within Safari's address bar. When you're at the website you'd like to share (like, say, this one), replace the address with "mail-link:" (minus the quotes) and hit return. A new message will be created in your default email client, with the site's title as the subject and URL in the body (as if you had selected "Mail Link to This Page" from the File menu). Cool. I've made "mail-link:" into a Safari bookmark, so now it's just a click away.
Anyone else know of some cool Safari tricks?