WS-Performance hits the road
Definitely the most important spec this year, published April 1.
Web Services Performance (WS-Performance) provides policy assertions that can be used to describe Web service performance characteristics and in particular provides set of metrics for already existing Web Services specifications. One of the most important concerns when composing Web Services is impact on performance of each specification. Therefore if there could be a synthetic indicator of performance impact of each specification it could help to automate estimation of composed Web Services performance and that is the role of WS-Performance to provide framework for such estimations. This specification composes especially well with WS-Goodness to provide Web services that are both good and of reliable performance and although currently may be a bit slow (as all Web Services ...) but WS-Performance helps to estimate how fast (or slow) they are.