Need a chemical? Find out which household product contains it and the concentration.
http://www.householdproducts.nlm.nih.gov/
Learn about Minerals
http://www.mindat.org/
Old Technology
http://www.primitiveways.com/
Know your Ordinance
http://maic.jmu.edu/ordata/Mission.asp
Learn Lock Picking
http://www.lockpicking101.com/
Stories of Victorian science experiments, some real, some not.
http://www.lateralscience.co.uk/
Things I won't work with - stories from a chemist
http://pipeline.corante.com/archives/things_i_wont_work_with/
Cheesy Eurodisco
http://blog.wfmu.org/freeform/cheesy_eurodisco/
Awesome Data Archive
http://frondeur.homelinux.net/public/hosting/PFRC/
Videos of awesome presentations from Fermilab
http://www-ppd.fnal.gov/EPPOffice-w/colloq/colloq.html