Creating List Definitions in SharePoint 2007

I found this interesting links on Creating list definitions

http://karinebosch.wordpress.com/walkthroughs/creating-a-custom-list-definition-based-on-a-generic-list-using-a-custom-content-type/

http://karinebosch.wordpress.com/walkthroughs/create-custom-lists-in-caml-based-on-existing-list-templates/