The projects listed have been documented over several years to build self-standing Web Browser Kiosks using the LTSP base
Current Packaged Solution for ubuntu/LTSP with the --kiosk option by Oliver Grawert
The HowtoWriteLTSP5Plugins page describes the details of the current plugin for an ltsp Firefox kiosk. It is installed using an option that is included with the Gutsy/7.10 distribution:
There is a bug that needs to be fixed before running this command (on Gutsy as of 1/31/08)
Other LTSP based Implementations
The following implementation documents describe step-by-step methods that were used to build Web kiosks. They might be considered outdated since they use older versions of LTSP and browsers:
Diskless Linux Kiosks by Jamie Zawinski
Linux-based WWW-Kiosk using LTSP 3.0 by Matti Lattu
LTSP for Libraries Howto by Cindy Murdock
Even More Implementations
With a little bit of searching, you can find lots of Kiosk projects.
Gene Wilburn of the Royal Ontario Museum has a widely replicated Kiosk HOWTO from 1999
Additional Community Kiosk References
https://webconverger.org/ is an opensource Firefox based kiosk project, based on Debian stable. http://webconverger.org/pxeboot/ / LTSP mode of operation is not supported. Instead images are deployed by USB and optionally administered via a simple httpd configuration server that serves INI style configurations that are cached in the case the server is down.