IMac suddenly can't see any wireless networks!

I have a recurring problem with my iMac 20" Intel Core Duo.
For some reason, it suddenly loses the ability to see wireless networks. The problem is resolved if I restart. I go through this several times each day, and the frequency of the problem is increasing.
Strangely, there is nothing wrong with my Airport Extreme wireless network. My other computers see it just fine.
And when I check the Airport indicator at the upper right-hand side of my iMac's desktop during this problem, it shows NO wireless networks at all! And I have 7 neighbors with wireless networks on 24/7!
As I said above, the solution has been to restart my computer, at which point all the networks appear again.
Can anyone offer a solution/explanation? I have tinkered with my network settings to no avail.
Thanks in advance for any suggestions.
MacBook Pro, iMac 20" Intel Core Duo Mac OS X (10.4.9)

It has to be unrelated because I too have been having the same issue for the past 2 weeks. Actually it seems that ever since I reloaded the last iMac intel update (which I had to do to get my iSight to work again)
I've been having this issue multiple times a day. I even moved my iMac thinking I had too much distance and walls between the router and the iMac.
I know it isn't the router because the laptop in the house picks up a very strong signal all the time.
I tried switching channels on the router (a linksys) and it has seemed to help a bit. I am now down to dropped signals only about every other day.

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IMac suddenly can't see any wireless networks!

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