SharePoint Designer

http://blogs.msdn.com/publicsector/archive/2007/05/22/document-workflow-how-to-sending-an-email-with-sharepoint-2007-moss.aspx

http://sharepointsolutions.blogspot.com/2007/10/sharepoint-designer-workflows-how-to.html

http://blog.dreamdevil.com/index.php/tag/sharepoint-2007/

http://patrikluca.blogspot.com/2008/11/lookup-user-info-in-workflow.html

http://unitedsupplyco.sharepointsite.net/publicfacing/bensblog/default.aspx

http://unitedsupplyco.sharepointsite.net/publicfacing/bensblog/Lists/Posts/Post.aspx?ID=54