Ethereal Network Packet Protocol Analyzer

I just rediscovered the Ethereal network protocol analyzer.  I was trying to track down a problem using the tcptrace proxy which is a nice simple little tool when it works.  I'm not quite sure what the problem was, but I was seeing different behavior when I was using the proxy than when I wasn't, so I went for the full blown driver level sniffing that Ethereal provides.  It's based on the work of the WinPCap organization.