These are some interesting links that I have found on the subject of NIXIE tubes

Mikes electric stuff. Really good site not only for NIXIE tubes and projects but also strange display stuff.

http://en.wikipedia.org/wiki/Nixie_tube. A short explanation on NIXIES.

http://www.decodesystems.com/nixie.html. Another page that explains NIXIES and shows how they were used.

More coming soon.