Takeaway: Despite businesses huge investments in SOA, so far they have seen little ROI. But the next generation of SOA, called Web-Orientated Architecture (WOA), utilizes the web, with the web being called the largest SOA in existence. WOA services are built using REST and enterprise mashups, and continues to use HTML and XML. And while SOA requires well-defined endpoints, WOA's endpoints are almost unlimited.
FYI: ebizQ has an upcoming Webinar on exactly this subject titled Web 2.0 & SOA.