Another post available on sp365 about getting a list of All People in SharePoint 2010. This list was available in 2007, but was removed in 2010. See how to get it back! http://sp365.co.uk/2012/04/all-people-in-sharepoint-2010/
I have written another post for SharePoint 365, check it out: Determining which w3wp process goes to which SharePoint service.
If you don’t know about SharePoint 365 yet, go check it out! It’s at www.sp365.co.uk. I occasionally write for that site, and that’s where this post will go. Check out my post Initial Topology Planning: Site Collections vs Subsites.