I purchased Agile Web Development with Rails 3.2 in July 2010, but you have been sending me updated editions ever since. The last I checked there was Agile Development with Rails 4-b4_0.pdf updated on 26th June in my Dropbox folder. I never expected, and moreover, I was prepared to purchase a new edition, but finding it in my Dropbox folder was a pleasant and wonderful surprise.
That also brings me to the goodness of ebooks. These days I tend not to purchase physical ebooks. First of all, planting trees is definitely going to do a lot of good, if not, saving a few trees from being cut down will. So why waste paper on those monster size books that go out of relevance in less than a year. That also makes them hard to carry, harder to search, even harder to bookmark and put notes on. All you need is a good pdf viewer like 'Preview' on Mac and you are good to go.
I came across a saying on the carry bag of Landmark stores -
One who lends a book is a fool and one who returns is a bigger fool.So, a book lent is as good as lost, not so with ebooks (if you have the rights).
Coming back to the goodness of Pragprog, the best feature I liked so far was their Dropbox integration. Now you don't need to download it every time there is a newer version and it automatically gets synced via Dropbox.
Apart from this, thank you for being so awesome publisher publishing so many creative titles. For being so nice as not to have DRM on digital content and trusting that your readers will do the right thing. For being a die hard Lisp fan, and spreading your passion about functional programming. For not being greedy and in the end thank you for being so genuine :).
I look forward to learn more from all the hard work you put in.