Since the Seven Things meme has been charging its way through the members of the PHP community (and some outside it), it's hard to keep track of who is tagging who and if those people have posted their "seven things" and tagged others. Michelangelo van Dam has tried to make things easier with his "Who Tagged Who" map mini-application that crawls through the posts looking for others who were tagged.
Trying to get a bit of overview of all people who have put up their "Seven Things" list, I created a little map that shows who tagged who with an overview of the most tagged persons.
You can also grab the XML source file if you'd like to manipulate it yourself.