I understand what you mean.
Have you ever considered a V.A. (Virtual Assistant?) Some folks can transcribe things very quickly & easily.
If I knew that you had pdfs of your talks I want to get a copy & read it.
Or you might take all your talks for a year & turn it into a book like the woman from "lifeHacker did with her blog,the book is "Lifehacker: 88 Tech Tricks to Turbocharge Your Day" it was a big hit.
see the current blog here:
http://lifehacker.com/