Custom Theme and Feature Stapling via WSP files

http://wssdevelopment.blogspot.com/search/label/Customization?updated-max=2010-04-07T14:00:00-05:00&max-results=20

http://blogs.msdn.com/ketaanhs/archive/2009/07/01/modifying-spthemes-xml-programmatically-to-deploy-new-themes-moss-2007-wss-3-0.aspx

My First Custom Site Definition

http://wssdevelopment.blogspot.com/2007/09/my-first-custom-site-definition.html