This week, I'm in a class on .NET 3.0, and already getting some useful tidbits. For example, there are a couple of very useful tools for building services in WCF. One is the Service Configuration Editor, which provides a visual editor for .config files for WCF services, allowing you to edit your WCF service configuration without digging into the markup.
The other useful tool is the Service Trace Viewer, which is a viewer for Trace log files generated by WCF request tracing.
Both tools are included as a part of the Windows SDK for Windows Vista and .NET Framework 3.0.