Pragmatic Bookshelf
The Pragmatic Programmers is an agile publishing and training company and they are responsible for some of the best computer books available.
They have taken the innovative step of releasing ‘beta’ versions of their books as pdfs. I have taken advantage of this by paying for the beta version of their iphone sdk book.
Now it might seem dumb to pay for a book that isn’t done and may contain errors and I would tend to agree. But now that the iphone NDA has been lifted, the beta pdf is the fastest way to get a book to market and for me to get my hands on it.
What I would like to try next is an ebook reader. I like the Sony readers because they don’t tie you to one provider and copying a pdf onto memory card (as opposed to a download service) makes more sense to me.