Experiences of installing and using Linux on a Toshiba Satellite P20 can be found here:
http://members.optusnet.com.au/ric_on_the_go/linux_with_toshiba_p20/

This page includes:
- Using Knoppix
- Guide to installing Gentoo (to supplement the
official installatino guide)
- Using Mandrakelinux
- Links to other instances of Linux on P20s

Useful items found on this page are:
- The Gentoo make.conf file
- The kernel compilation settings (for 2.4.25)
- An example grub.conf based on booting into Windows XP, Gentoo, and Mandrakelinux
- XF86Config file
- Screen shots

This page will continually be updated, as more distros are tried.