[Tightscot]

things to try:
change the channel the wireless uses
change the wireless speed to b only / b/g / gonly etc etc (if the router allows it)
double check you're router is not hiding the ssid
temporarily set the wireless up with no security enabled - make sure you switch security back on afterwards.

try all these changes at the router end, and each time you've made a change, run a couple of scans to see if your machine picks up the wireless...

also, make sure when you're machine 'returns' the list of available networks that you scroll through the whole list of networks.... just in case it is picking up your ssid, but isn't displaying it in the view...