Today I uploaded all the presentations that I have held at tech conferences over the years to SlideShare. (At least those that were in a reasonable format. I was a user of DocBook Slides in the early days, which produces HTML, which you can't upload to SlideShare.) That was quite a trip through history for me; 6 years of traveling, meeting people, pondering ideas.
I have also gone through and licensed all presentations and this blog under a Creative Commons license. For various reasons I chose different variants of Creative Commons for different bits, but in the future I plan to mostly use the CC-BY variant, which is much like the BSD license in spirit.