From their website:
KNOPPIX is a bootable Live system on CD or DVD, consisting of a representative collection of GNU/Linux software, automatic hardware detection, and support for many graphics cards, sound cards, SCSI and USB devices and other peripherals. KNOPPIX can be used as a productive Linux system for the desktop, educational CD, rescue system, or adapted and used as a platform for commercial software product demos. It is not necessary to install anything on a hard disk. Due to on-the-fly decompression, the CD can have up to 2 GB of executable software installed on it (over 8GB on the DVD “Maxi” edition).
From their web site:
The Realm MPS is the worlds first and only easy-to-use, secure, USB powered computing device that can be used any place, any time, on any operating system.
Basically, you can carry a Linux server in your pocket that can be connected to the USB port of any PC.
The cheesy promos they have done with Jon Lovitz not withstanding, this device looks to be quite interesting.