This page is a listing of organizations and educational organizations that can provide you with more information on the fields of cryogenics, cryophysics, and cryotechnology.
http://www.cryogenicsociety.org; Cryogenics Society of America
http://www.wmi.badw.de/ ; Walther Meissner Institute: This site doesn't have much information on cryogenics but it is pretty cool to look at.
http://superconductors.org ; Superconductors.org: This site is one of the best I've seen ever on the field of superconductivity.
http://www.eere.energy.gov/superconductivity/; Department of Energy program for superconductivity: This website has the best information on superconductivity history.