Customize Content Query Web Part

http://www.sharepoint-tips.com/2007/01/teach-content-query-web-part-how-to.html

http://www.microsoft.com/belux/msdn/nl/community/columns/stevenvandecraen/contentquerywebpart.mspx

http://msdn.microsoft.com/en-us/library/bb850574.aspx

http://www.datasprings.com/Resources/ArticlesInformation/AboutSharePointContentQueryWebPart/tabid/835/language/en-US/Default.aspx