Italian hobbyist DECNet Network - Rete DECNet hobbystica Italiana
FreakNet Computer Museum - Museo dell'Informatica funzionante
IPv7.net images on Flickr
IPv7.net images on unixantichrist.net
Retronomicon
A short list of retro/obsolete system in my collection:
DEC, Sun, IBM, SGI, Apple, HP, Data General AViiON, Misc