One of the best debugging tool we use in our everyday life as a developer is debugview.
Many of us nowadays use virtual server and use remote desktop connections for development.
If you are writing some Trace.Write message from BizTalk to debugview, you wont be able to see the messages. Login to the remote desktop using the "/console" switch so its like working on the console directly.
The interesting fact is that DebugView was able to catch the Trace from a sample .net console app.
Hope it saves someone sometime!