Brett has a relatively straight forward script to insert a link from an the Address Book entry to an NVAlt note. This is going to be extremely useful on the Mac and gives me all kinds of ideas.
For what it's worth, I usually keep notes about people in 1Password. I would feel horrible if some how my personal notes got out. Their not bad notes, but some of the notes contain social security numbers for my family as well as their WiFi passwords for when I visit (or they forget it and call me).