If so, then you are probably familiar with Ethereal (now WireShark) for packet monitoring. If you haven't played with Microsoft Network Monitor (Netmon.exe) since you tried it briefly in your MCSE 2000 course five years ago, I would strongly recommend taking another look. It has been re-written from scratch, and has some pretty awesome features.
The NetMon blog covers what we added in version 3.0 here: http://blogs.technet.com/netmon/archive/2006/09/27/459474.aspx
Best practices for using Microsoft Network Monitor (Netmon.exe) to capture packets can be found here: http://support.microsoft.com/default.aspx/kb/812953
Just a few short months after the release of version 3.0, however, 3.1 has just been released to Beta. Signup to downloat at https://connect.microsoft.com. New features include: