Specifying Security the right way in a web part

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

Apply color coding to your SharePoint lists

http://pathtosharepoint.wordpress.com/2008/09/01/apply-color-coding-to-your-sharepoint-lists/

Serivce Locator Design Patterns

http://msdn.microsoft.com/en-us/library/cc707905.aspx

Displaying List Attachments in Custom List Forms

http://www.sharepointu.com/maartene/archive/2008/06/18/displaying-list-attachments-in-custom-list-forms.aspx