This week's giveaway is in the EJB and other Java EE Technologies forum. We're giving away four copies of EJB 3 in Action and have Debu Panda, Reza Rahman, Ryan Cuprak, and Michael Remijan on-line! See this thread for details.
To make SOA work, there are some basics that you should understand and follow. Here I will focus on one, loose coupling, which refers to many other principles of SOA and list many others, with lots of links to sites with good explanations and guidelines