It is funny i was just looking to do this myself... I want to disable the Start Button completely. I used Group Policy on the local machine.. even though this is on a Domain but will not configure this group of users on the server so local policy will work. In doing so it lists nothing in the start menu except for "programs" which still lists Accessories, start up, IE, Outlook Express, Remote Assistance, Windows Media Player. These machines will be running an ap that will run from start up and will not be able to be shutdown but still the Start bar shows which will give them some accessibility.
Bill