Moving Sharepoint List item to another Sharepoint List

http://blog.henryong.com/2008/01/21/how-to-movemigrate-sharepoint-list-itemsdocuments-and-preserve-metadata-properties-at-the-same-time/

Specifying Security the right way in a web part

http://www.dotnettipoftheday.com/Blog.aspx?Id=367