KDE -- Setting up a secure graphical desktop
Links -- More links
Library -- HowTo for secure library computers
Biodiversity -- Case-study of setting up web-browsing terminals
DNALounge -- Setting-up high-functionality public computers in a nightclub (detailed guide)
Most Linux desktops are secure enough that locking them down to something that can be used in a library or public area isn't as difficult as it sounds. Checking which programs you want available, preventing changes to application settings, and making sure it reliably boots up into the right mode are normally all that's needed.
See the links for some case-studies and more information
