I'm planning a change in the formats that will be available from this blog when the new edition comes out. While my books will be available free of charge, I'm not going to maintain all electronic formats.
It is a pain in the butt to ensure all versions are corrected and up-to-date when changes are made when I have to handle the conversion process myself, especially because the conversion can cause problems. An example of this was converting from PDF to HTML and ebook formats; while the PDF was correct, the other books were truncated after chapter six.
In light of this, I will only directly host the PDF version myself, since I can do a direct export from LyX to those formats. I will use the SmashWords conversion system to make the conversion to other formats; the print version will also be available as well.
What this means is that you won't be able to download a free copy directly from my blog, unless you want PDF. However, I have no problem with someone buying a copy in whatever format they want and uploading it to a file locker, making a torrent file, or sharing it some other way.
I'm not trying to do this to make money (though that never hurts) but because I don't want to worry about maintaining multiple copies myself. On the other hand, if you find something that needs fixed, please let me know and I will make a new version available.