Does anyone have Drupal on a Stick?

Over in the DrupalCampUK event planning thread started by Galooph, Richardcanoe mentioned:

"There are lots of Apache - MySQL - PHP implementations out there now for both windows & MacOS which are designed to be hosted on a USB stick.

Attendees could have a drupal on a stick as something to use at a DrupalCamp, but also to take away and play with. This would enable non tech users to get to grips wth the look and feel and test modules and settings.
" http://groups.drupal.org/node/15537#comment-54618

Does anyone who's organized events have any examples of a distribution for a key?

Does it depend on the OS of the person's computer they bring? Could the key also have a *nix OS on it as well?

I'd like to sbe able to download a disk image and plonk it on a key, which already had the OS, Apache, MySql, PHP and 3 sites with drupal, 5.x, 6.x and 7.x on it.

Has anyone ever put this together? Anyone know how to put this together?

Thanks for any tips/links/leads, etc!

(It'd be great to use it at our event in Ireland on 15th of November, but we're pressed for time I suppose).