if you are a WCF Developer / Analyst,and you want to trace all messages between your WCF Services and theri clients,MS Provide a tool to monitor and trace all SOAP Messages between the services and its clients called "Service Trace Viewer"
TO Open Service Trace Viewer Tool :
C:\Program Files\Microsoft SDKs\Windows\v6.0\Bin), and then type SvcTraceViewer.exe.
Files Supported by this tool :
**WCF Tracing File (.svcLog) -> this will be used for tracing purposes on your WCF Apps.
**Event Tracing File (.etl)
**Crimson Tracing File
Read more on Service Trace Viewer :