Some links of interest for EPR people:

European Federation of EPR Groups

EPR at National Institute of Environmental Health

Scientific Software Services Home Page

EPR Software DataBase 

Internationa EPR Society (IES) 

Society for Free Radical Research (SFRR Europe) 

Fachgruppe Magnetische Resonanzspektroskopie (NMR / ESR): 

The Nordic EPR Society (NES) 

ESR group of Royal Society of Chemistry