A very comprehensive and helpful site of SGI systems from the Personal Iris to the Onyx2. It includes old product brochures, benchmarks, and several second-hand buying guides. http://www.futuretech.blinkenlights.nl/sgi.html
Nekochan is an information site for users of SGI's machines. It has several active forums, an excellent gallery section, and a wealth of ported software available for download. http://www.nekochan.net
SiliconBunny is a help and information site for users and administrators of Silicon Graphics machines running IRIX. Along with technical information it provides an RSS feed of SGI news. http://www.siliconbunny.com