krs

http://norpoint.wordpress.com/2010/08/04/sharepoint-20102007-custom-site-column-field-type-and-options/



http://nishantrana.wordpress.com/2009/03/21/adding-a-read-only-field-or-read-only-column-to-sharepoint-list/

http://office.microsoft.com/en-us/sharepoint-designer-help/create-a-custom-list-form-HA010119111.aspx