Via this pointer on the PHP Magazine site today, there's a note about a new project that seeks to put PHP on a thumbdrive.

PortableWebAp is a portable platform for web applications. With it you can run php web applications from a usb drive or from any hard drive Your php applications can be preinstalled and run from a desktop pc and no install is required. Simply copy the files and launch the application.

Special Attention has been given to make it easy to use and small in size. The current size is 22.6 mb.

Included in the Windows-only package is PHP 5.0.4 (including various extensions), Apache 2.0.54, MySQL 4.1.12a, and SQL Lite.

It's kind of a cool idea to have this all where you need it and easy to tote around with you, but I wonder just how useful it might be...I suppose if you just wanted to hack away at something and didn't have your machine with you, it might be pretty nice, but I can't see using it for any kind of real development work...