You can see what changes people in the CNET office have made to the BOL page, or the Tom Merrit Rules page...
I can't see what changes were made since I'm at work and wikipedia is blocked here, but CNET has made quite a few changes (though most have not been to CNET related entries... and Tom, is that you making all of those Back To The Future III changes?)
I found a link on digg today that pointed to a wired article reporting that a grad student has released a tool allowing people to link the IP addresses of people who made wikipedia changes to the owners of those IP addresses. It's not 100% as it can only tell you what network the changes came from, not the individual person, but it's still interesting to see what changes have been made to make people look better/worse and linking it to the responsible company.
O'Reilly blog post about Fox News changes: http://radar.oreilly.com/archives/2007/08/wikipedia_is_on.html
Original wired story:
Link to the tool itself: