I chose to include my iChat, Email, Flickr photos and my MySpace. If anyone is interested, I would be happy to make one with your information for your own profile. Just leave a comment as to what you'd like included.
Okay, so... this is not exactly for your Mac, but more for your LJ profile page. I made this because I want people to be able to contact me, but I don't want spam bots finding my email (which always seems to happen when I put it in my user info on LJ), so the way to get around that was to make it an image instead of searchable text.