Wireless Network has "disappeared" after Leopard installation

We have 2 Macs, my MacPro (connected by wire to ADSL) and an iMac (connecting to my wireless router to the same ADSL line). The iMac uses Airport to reach my wireless router, connecting to "Joe's Network." (MacPro --> D-Link Modem --> D-Link Wireless Router --> iMac Airport) This has worked fine for about 2 years.
After installing Leopard yesterday, the iMac does not show "Joe's Network," and I don't know how to restore it. Other networks in the neighborhood show up in the iMac's Airport listing, and the unsecured ones CAN be connected to. This indicates to me that there is nothing wrong with the iMac. I unplugged and replugged the modem and router on my MacPro, but nothing is working.
Can someone point me in the right direction?

Ahh, welcome to the wonderful world of wifi under Leopard. Maybe you weren't aware that tens of thousands of people have been having endless problems with wifi whilst using Leopard .... I just got back from holiday - full signal yet no internet. Connect using ethernet and there it is - working perfectly. The culprit? Apple's very own Airport extreme base station, the new one which I bought thinking my old one was on the blink - nope.
Meanwhile Apple have not said a word about this in the last 8-10 weeks of utter misery for countless people - not a sausage. Many people are counting on 10.5.2 fixing this. I say don't count on it. Remember to complain to Apple as it is their own software/hardware that is at fault here. Meanwhile, they introduce a ... wifi laptop.... ooh the irony.

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