Casio put out a free promotional CD-ROM that contains some interactive information about the 25 year history of G-Shocks. These discs were freely given away at shops that received them along with other 25th Anniversary promo materials.

25th Anniversary CD-ROM

The CD contains Flash files featuring a variety of G-Shock content. Here's a couple screenshots.

Main Menu

Interactive G-Shock Timeline

Right now, you can download the CD contents here on Rapidshare (52MB). Start it up by running "G-SHOCK.exe". Maybe someone will post a torrent of it?

Thanks GameBoy2Go.