Gasp choke uh it's hard to breathe! I can't get enough (air) into these (lungs)

Actually the internet has slowed to a gasping modem rate. Maybe it's SpeakEasy, or maybe someone has discovered my completely free-and-open wireless connection and they're stuffing it with multimedia letters to their family members.

CHecker has a wi-fi network, his SSID is "open_but_be_nice" - maybe I should rename mine, "i_pity_the_fool." Does anyone know of a tool I can run to sniff to see where my wireless signal is being shared? I have a Linksys WRT54G.