I found a great resource to help people learn speed reading from a book. If you like it, consider going onto the site and contributing to the author. He doesn't charge, but accepts donations. (And no, I'm not affiliated with it, but I did learn useful stuff from it.)
http://www.semanticrestructuring.com/lookma.pdf
After following the advice in it, I found my reading speed to roughly double, while my comprehension stayed about the same. By the end of the book, I was speed reading the book as well.
Despite that, my reading speed is still only around 400 WPM.
Phrodod