hehehe
An old website
http://members.lycos.co.uk/linuxserv/ (all links on that page are dead though)
or even better LOL... Thats our Meth :D
http://members.lycos.co.uk/linuxserv/xs/
or Xnet (Most of this site is still intact including the xnet download)
http://members.lycos.co.uk/linuxserv/xnet/
Nothingface5384's p2ptruth forum (also administrated an informative site known as XS central which now sadly is also dead)
http://s4.invisionfree.com/p2ptruth/index.php?act=idx
Those are just a few things i have found thus far nothing on my HDD's, I documented a lot of stuff back in the day :)
It was also cool for me to rediscover my old XSi website design templates and mock ups hehehe... things just never went my way and hosting was always a b!tch although I'm sure if i ever did find a suitable host it would still be up to this day... in retrospect i should have just uploaded a site on lycos that way we would have had some documentation and files available plus it would have been worth a laugh or two.
Persistance and a little more research has uncovered more links to XS related sites from the past created by old timers from the Xnet/XS era.
http://www.cyberbork.tk/ - just contains various links
http://www.hostultra.com/~xscentral/ - Great source of info with so downloads (good 'ol Nothingface5384 site)
http://xscentral.coolfreepages.com/ - Mirror for the above.
Although there are very few old timers still around for the few that are enjoy. 8)