Sharepoint Excellent Blogs

SharePoint Profile Cleanup

http://blogs.technet.com/b/seanearp/archive/2009/03/04/sharepoint-profile-cleanup.aspx
http://blogs.msdn.com/b/gyorgyh/archive/2009/11/13/how-it-works-moss-2007-automatic-user-profile-removal.aspx

SharePoint List Xml Schema

http://blogs.msdn.com/b/kaevans/archive/2009/05/01/getting-xml-data-from-a-sharepoint-list-the-easy-way.aspx

Get SPUser object from SharePoint List Item People/Group picker field

The code below is to get SPUser from a multiple user item column 

            string strURL = "http://YourSite/";
            using (SPSite oSPSite = new SPSite(strURL))
            {
                using (SPWeb oSPWeb = oSPSite.OpenWeb())
                {

                    SPList list = oSPWeb.GetList(strURL);
                    SPListItemCollection items = list.Items;
                    foreach (SPListItem oListItem in items)
                    {
                        if (oListItem["Title"].ToString() == "Test")
                        {
                            String usersString = oListItem["Audience Group"].ToString();
                            SPFieldUserValueCollection userValueColl = new SPFieldUserValueCollection(oSPWeb, usersString);

                            foreach (SPFieldUserValue userValue in userValueColl)
                            {
                                SPUser siteUser = userValue.User;
                                Console.WriteLine("User found: {0}", siteUser.Name);
                            }
                            break;
                        }
                    }
                }