Superconducting Magnets
    http://www.americanmagnetics.com/
    http://www.cryomagnetics.com
    http://www.oxfordinstruments.com/
    http://www.magnet.fsu.edu/

mK refrigeration systems
    http://www.oxfordinstruments.com/
    http://www.leidencryogenics.com/
    http://www.cmr.uk.com/
    http://www.janis.com/prodults.html

Temperature controllers and sensors
    http://www.cryocon.com/
    http://www.lakeshore.com/
    http://www.scientificinstruments.com/

Cryostats
    http://www.cryoindustries.com/
     http://www.janis.com/

Close Cycle Refrigeration
    http://www.apdcryogenics.com/
    http://www.cryomech.com/
    http://www.helixtechnology.com/
    http://www.leyboldvac.de/

Dewars
    http://www.cryofab.com/
    http://www.intlcryo.com/
    http://www.precisioncryo.com/

Biomagnetism
    http://www.lists.ulg.ac.be/mailman/listinfo/biomagnet
    http://www.sourcesignal.com/
   
Iron Overload
     http://www.ironoverload.org/
     http://www.childrenshospitaloakland.org/healthcare/depts/ferritometer.asp
     http://www.irondisorders.org/
     http://www.eiseninfo.de/squid.htm

Superconducting Filters
    http://www.suptech.com/

Gravimetry
    http://www.gwrinstruments.com/

Vacuum Technology Links
   
Cryogenic Links
    http://www.noramcryo.com/Links.html

Meetings
    American Physical Society:  http://www.aps.org
    Applied Superconductivity Conference: http://www.ascinc.org/
    International Conference on Biomagnetism: http://www.biomag2008.org/
    CEC-ICMC: http://www.cec-icmc.org/
    European Conference on Applied Superconductivity:  http://www.eucas2009.eu/