Mineralogy / Petrology / Geochemistry Sites
Mindat.org - everything you could want to know about minerals and mineral localities 
GeoRoc - huge searchable database containing over 2,000,000 whole rock chemical analyses
Washington Geological Survey - 'the' source for maps and publications on Washington geology 
Quimper Geological Society - based in Port Townsend, the QGS sponsors talks and field trips
Nick Zentner - videos and YouTube lectures on PNW geology, plus links to many papers on the topic

Other Miscellaneous Sites
Horseshoe crabs -website of organization dedicated to protecting these living fossils