I often send a link off to one single person, many times a day. You can use the Mail Link to this Page feature in Safari, but that still means you have to compose the email with the To address, and also tell the email to send. Since I do this several times a day, I decided to AppleScript it. Drop the following script into ~/Library » Scripts » Safari; name it what you like. If that folder structure is not already made, just make new folders with the correct names.
The script will get the current URL of the frontmost document in Safari. It will not copy it to the clipboard, leaving your clipboard in the same state. The script them brings Mail.app forward, addresses an email, sets a subject, some body copy, and drops the URL into the email. Finally, a signature is added to the message, and it is sent out. After that has happened, Mail.app is set to hidden, and Safari is brought back to the foreground where you last left it.
Here's the script:
Mac OS X Hints
http://hints.macworld.com/article.php?story=20080213202340174