As Gartner has published their 'Top 10 Strategic Technology Areas for 2008', of which several are related to SOA; this is my two cents about two more specific topics that are important for you as an architect and developer of service-oriented systems:
Read the relevant articles to learn more about these indeed very technical topics, you really cannot manage a complex set of hundreds and thousands of services without such SOA operations and lifecycle governance technologies. Microsoft is on the ball with the BizTalk ESB Guidance and the partnership with AmberPoint (in use at Vital Forsikring in Norway) and SOA Software.
Also check out the Connected Services Framework being used at telecos around the world (watch video). You can play with aggregated services and managed network mashups at the Connected Services Sandbox.