This is one of the coolest things I came across at Blackhat/DEFCON. DAVIX is a collection of security visualization tools. It allows you to do things like build maps from pcap files, map protocol use in real time across a network, etc.
Here are some examples of the type of stuff the project produces.
[ Graph Exchange | secviz.org ]
Trust me, it’s sick. Go get a copy of it. And be sure to check out the SecViz site in general. Very innovative stuff.
[ The SecViz Site | secviz.org ]
[ The DAVIX LiveCD | secviz.org ]