One can find the coolest stuff at Metafilter. For example, today, I followed a link from there and found a web page containing scans of 47 of Linus Pauling (Linus Pauling!!!)’s notebooks. There’s everything from correspondance to personal journal entries to loads and loads of chemistry experiments.
Pardon me while I let my inner chemistry geek out for a moment…
I AM LOOKING AT LINUS PAULING’S LABORATORY NOTEBOOKS!!!
Ahem. That is all.