Just been posted - a technical preview of Web Services Enhancements (WSE) 2.0. If you haven't come across WSE before, it's a package that provides support for new and emerging web service standards such as WS-Security, WS-Transaction and WS-Addressing. Fairly safe to install (i.e. it shouldn't break any existing web service stuff, and it runs side-by side with WSE 1.0). Recommended if you're feeling frustrated with the lack of application-level services currently available to web services. Eventually this stuff will be rolled into the .NET Framework itself.

The downside to all these additional standards is that inevitably the process of exposing and consuming web services gets more complex. The beauty of web services such as MapPoint and the Amazon web service today is that they're so easy to access and manipulate. Hopefully the pendulum will eventually swing to an equilibrium between ease of use and service capability.