There's a lot of mystery still surrounding service-oriented architecture. Many people--even in IT--say they don't fully understand what it can do, or how to go about building one. For a subject that is being hyped to incredible levels by vendors and analysts, there is precious little information about the fundamental implications of this new approach. <A HREF="http://blogs.zdnet.com/service-oriented/?p=1022&tag=nl.e622">Here are some of the unsolved mysteries that still persist around SOA.</A>