USB Tiki
See the documentation at USB Tiki for XAMPP.
For a full Tiki installer for Windows, you can use WebPI.
Server packages
- http://www.easyphp.org/
- http://portableapps.com/apps/development/xampp
- http://www.uniformserver.com/
- http://www.chsoftware.net/en/useware/wos/wos.htm Create a package!, TikiWiki available in premium package
Client
http://portableapps.com/apps/internet/firefox_portable
Thus, on a USB key, you could have both the client & the server aspect of a portable Web Operating System.
Implementations
Read http://tiki.org/UsbTiki for a Linux implementation.