The NM3.1 is now available on http://connect.microsoft.com featuring wireless sniffing and an easier way to create filters using "Right Click Add To Filter". Here is a list of features that are new to NM3.1.
Why is this a big deal? Because of feature #1:
Wireless (802.11) capturing and monitor mode on Vista
There’s a ton of other features but the ability to sniff wireless WiFi packet data is very key. You can sniff all channels or just a subset. And you can see what signal strength and transfer rate you can get in different physical locations.
What makes it even cooler is the fact that this tool is usable by humans that don’t have PhDs in packet analysis, it runs only on Windows, and it’s TOTALLY FREE!
READ MORE AT: http://blogs.technet.com/netmon/
Kurt Shintaku's Blog 