This week's book giveaway is in the OCMJEA forum. We're giving away four copies of OCM Java EE 6 Enterprise Architect Exam Guide and have Paul Allen & Joseph Bambara on-line! See this thread for details.
People always ask which books are good for this exam.
I've been recently reading a book called Rest in Practice: Hypermedia and Systems Architecture by Jim Webber, Savas Parastatidis and Ian Robinson.
I am reading chapter 3 now, this book does a good job introducing Rest concepts.
Besides Ivan, MZ's notes, RMH's book and Java Web Service Up and Running, I suggest this Rest in Practice book for supplemental reference.