One Quickie

Printing network traffic (Unix->Hacks)
% sudo tcpdump -Atq -s 0 -i en1
-i en1 will display traffic on your airport card. Use en0 (or nothing, for most systems) for built-in ethernettage.

You can add a host line to limit output to a particular host

% sudo tcpdump -Atq -s 0 -i en1 host
(thanks to Dan Jalkut for this one)

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