Ethereal: "Ethereal is a free network protocol analyzer for Unix and Windows. It allows you to examine data from a live network or from a capture file on disk. You can interactively browse the capture data, viewing summary and detail information for each packet. Ethereal has several powerful features, including a rich display filter language and the ability to view the reconstructed stream of a TCP session." This thing looks very cool. Check out the screenshots. I'll probably use this now instead of REBOL for getting network info.
Oops, it needs some extra components to capture live data from the network. Here's the Ethereal readme for Win32. It needs the Windows Packet Capture Library.
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