This won't help the old pro's but I found a link to tech bulletins for some tool steels, including O1, L-6 and D-2 that explains heat treatment and the like. Great stuff for guys that don't know anything yet (of which I am at the top of the list). The link is:
http://www.lindquiststeels.com/html/literat/literat.html
http://www.lindquiststeels.com/html/literat/literat.html