Our dear friend from the north and favorite DCC, Jeff Brand, posted some pretty good tips about managing/monitoring WCF applications he heard from Craig McMurtry (yes, this Craig McMurtry), Longhorn Server App Platform Evangelist. If you got the time, check them out.
I will have to say that if you’re not following tip #1, you’re a masochist; large XML config files != love. (FYI on tip #1, this is installed as a default tool in VS2005 when you install Beta2 of WinFX (sorry, .NET Framework 3.0)).