Knoppix 3.6
 

KNOPPIX is a bootable CD with a 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 Linux demo, 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.

http://www.knopper.net/knoppix-mirrors/index-en.html

If you want to use it as a recovery CD for your WinXP installation I can also recommend BartPE

http://www.nu2.nu/pebuilder/

Windows based on the fly bootable OS from CD with CDwriter/network etc support