Identification, Images, & Information
For Insects, Spiders & Their Kin
For the United States & Canada
Clickable Guide
Moths Butterflies Flies Caterpillars Flies Dragonflies Flies Mantids Cockroaches Bees and Wasps Walkingsticks Earwigs Ants Termites Hoppers and Kin Hoppers and Kin Beetles True Bugs Fleas Grasshoppers and Kin Ticks Spiders Scorpions Centipedes Millipedes

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From the welcome page:

The Arachnological Hub of the World Wide Web for the study of arachnids (spiders and their relatives)
Acari - Amblypygi - Araneae - Opiliones - Palpigradi - Pseudoscorpiones - Ricinulei - Schizomida - Scorpiones - Solifugae - Uropygi ( Thelyphonida )

Basically a portal with lots of links to other sites of interest (including this site).
http://www.arachnology.be/Arachnology.html