I'm reading RESTful web services these days and I think it is bound to become a classic: well written, well structured, very informative and fairly independent of the daily trends, in my opinion.

The book contains tons of practical advice and examples which help a lot in making sense of REST in one's daily (programming) life.

I'm not through yet, but everything I read until now has helped in my quest to make the systems I'm working on more RESTful. Time will tell if I succedd in this...