Internet Explorer Client Registry Layout
http://msdn.microsoft.com/library/default.asp?url=/workshop/browser/configuration/clientreg/clientregistrylayout.asp

Internet Explorer Restrictions
http://www.regedit.com/display.php/442/

Windows Registry Guide, Internet Explorer
http://www.winguides.com/registry/category.php?401

Description of Internet Explorer Security Zones Registry Entries (Q182569)
http://support.microsoft.com/default.aspx?scid=kb;EN-US;q182569