Ethereal is the big one I know about. Its pretty industrial strength, but like said, its not voodoo magic. In addition to the info going back and forth, you are going to get the SYN/ACK messages, headers, everything. Theres a lot of data going back and forth that you dont think about.
As for the page of commands, any tool like that is going to have one. Sniffers are something built by people who know computers *for* people who know computers. Most of the more powerful programs are like that.
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"Good people do not need laws to tell them to act responsibly, while bad people will find a way around the laws."
--Plato
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