@ Alpine While you are looking at those, here is another one that is worth looking at.
http://www.codework.com/bcontrol/product.html
BrowseControl helps you restrict inappropriate surfing and enforce Internet usage policies in your organization. BrowseControl can: completely block internet, allow access only to Web sites you specify, denying access to any domain you enter and schedule internet ON at only certain times of day. E-mail, FTP sites, Instant Messaging, ICQ, Newsgroups, etc can also be restricted.
In addition to restricting internet activity and Application blocking there is the ability to lock User PCs (blank screen, keyboard, mouse). CD/Floppy Drives can also be easily locked/unlocked.
Thanks
Dudelive