Network Monitor 3.2 is a protocol analyzer. It allows you to capture network traffic, view and analyze it. Version 3.2 is an update and replaces Network Monitor 3.1. Network Monitor 3.x is a complete overhaul of the previous Network Monitor 2.x version.

Get it @ http://www.microsoft.com/downloads/details.aspx?FamilyID=f4db40af-1e08-4a21-a26b-ec2f4dc4190d&DisplayLang=en

More information on the features of this release @ http://blogs.technet.com/netmon/.