http://blogs.msdn.com/b/sharepoint/archive/2007/04/26/customizing-the-quick-launch-menu-adding-fly-out-menus-to-sharepoint-navigation.aspx
sharepoint templates: http://technet.microsoft.com/en-us/windowsserver/sharepoint/bb407286.aspx
http://blogs.msdn.com/b/arnts/archive/2010/02/10/walkthrough-create-a-simple-tag-cloud-web-part-based-on-search-results.aspx