A new PAG Application Block is about to be released, which is built on and extends the Enterprise Instrumentation Framework (EIF)

It will provide some new EIF event sinks for MSMQ, SQL, etc. and even deliver support for Request Tracing across Web Service calls ( Previously only available for Remoting)

And of course I wrote some WSE filters to enable Request Tracing over Web Services just the other week.... Oh well...

More info here