RESTful Web Services
by Leonard Richardson; Sam Ruby
Pub Date: May 01, 2007
Print ISBN-10: 0-596-52926-0
Print ISBN-13: 978-0-59-652926-0
I found this to be a pretty good reference book. What was most helpful was chapter 12 which covered several of the web frameworks. The chapter on Django walked through the framework from a Rails perspective, which was perfect for me since that's where I'm coming from. Also had some nice examples on dealing with JSON and how to organize your site around the concept of web services.
It did a nice job of explaining the difference between the Rails and DJango MVC philisophies, and even included a decent example of how to handle routing of actions.
I'd recommend this for the bookshelf mainly as a reference if you're in a situation where you need to jump between different languages and frameworks as it's pretty agnostic. Don't think I have the attention span to read it from cover-to-cover, though.