I was the project lead on this, which involved converting the Feynman Lectures from LaTeX to HTML. I'd be happy to answer any questions. Update : Most of the questions center on cost. I've answered in more detail below, but the short version is simple: no off-the-shelf converter was remotely sufficient for our needs, so we had to write lots of custom software, and writing custom software is hard.
Now I've just read the first two chapters online, and I have a question. Have the lectures been updated to 2013 physics, or should I read comments like this:
"We seem gradually to be groping toward an understanding of the world of subatomic particles, but we really do not know how far we have yet to go in this task." (last sentence in chapter 2)
..as being the state in the 1970s?
If so, what has changed then in the "big picture"? String theory?