Updating a list item without changing the Modified field
In WSS 3.0, it is now possible to update a list item (SPListItem) without changing the contents of the Modified or Editor fields.
This wonderful method is called SPListItem.SystemUpdate (has two overloads).
This solves the annoying problem where people would see some system user account that is responsible for the last update, and the time was also [...]
Read the complete post at http://feeds.feedburner.com/~r/DorRotmansBlog/~3/137254261/