With wirelesstools you can also use the command 'iwlist wlan0 scan' which will give just a simple list of what AP's it sees and their channels and ESSID.

EDIT: On the NIT the above only works when you're connected to an AP, unlike with most Linux wi-fi drivers where you can run the scan command before you connect. Still useful on the NIT though, except for the OP I guess as the problem was it wasn't possible to connect in the first place due to the router clashes.

EDIT2: All these scanning- and probing commands/tools/programs have the risk of stopping the wi-fi working altogether, requiring a reboot to get wi-fi working again. At least on OS2007.