Harvey, M.S. (2009). Pseudoscorpions of the World, version 1.2. Western Australian Museum, Perth
Maintained by Mark Harvey of the Western Australian Museum. I found out about this through an International Society of Arachnology email.
A comprehensive source of information on pseudoscorpions with a world catalog, a general description and excellent photo guide to families
From the home page:
Welcome. This website is designed to provide some basic information on the wonderful world of pseudoscorpions and, in particular, provide lists of valid names and a comprehensive list of the scientific literature that deal with pseudoscorpions. I would be grateful to receive any information that might be used to improve the website, in particular any errors or omissions that occur within the website.