Another idea would be to install something like nmap (another command line program) on your powerbook. You can use some of it's commands to locate all hosts on your network. For example:
nmap -sP 192.168.0.1/24 will ping all 254 addresses on the 192.168.1 network (a common network configured internally for people that are using NAT internet gateways and the like). It will return a list of all of the active IP addresses that it finds.
All three of the previously mentioned apps are open source. You will more than likely need to have the developer tools installed to make them work. A background in networking will help with deciphering the output of Ethereral and snort.
It's important to note, that even though you may not have any applications open on your Mac that you will probably see some network activity on your network (even when you are not logged in). This could be background processes running on the machines on your network, or other miscellaneous network traffic. Activity lights that light up just when they see activity on a certain interface are not necessarily an indication of any heinous activity occurring on your network. (Although it never hurts to check).
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