For my part, I've tried Lindows (Linspire) and didn't like it at all. I have not tried Xandros so can't comment on that. If you've discovered you like Knoppix there are multitudes of remasters that are geared for HDD installation. But, if you'd like the distribution on which Knoppix is based head over to www.debian.org and check them out. Using the network installation you can have a system up and running in short order (with the caveat you have broadband). Debian defaults to the Gnome Desktop but you can change it to the KDE that comes with Knoppix.

Just my little opinion.

'Goon