Two Macs - only one can connect to Airport at a time

Starting today, after 10 days of successful operation, when I came home I couldn't connect to my home (new "square" Airport Extreme) network with my Core 2 MacBook Pro. My wife was happily connected on her PowerBook G4.
Puzzled, I tried a few obvious things:
Airport OFF, Airport ON ... no joy
Logout and back in ... no joy
Restart ... no joy
Then I turned my attention to the Base Station:
Restart ... nope
Change to "None" security ... nope
Change back to "WPA Personal" ... nope
Humbled, I stopped and had dinner. My wife's G4 went to sleep, my Intel went to sleep. Now it gets interersting! My Intel woke up first and immediately joined the network -- I'm happy till I hear my wife say SHE can't get connected.
To make a long story short, I have two laptops on my desk, and only one can connect at a time! This is BIZARRE. Turn off Airport on either one and its buddy gets a connection immediately, and vice versa. Sleep the connected one and the other connects.
I am out of ideas.
Errors on the G4:
Feb 28 20:09:45 localhost configd[35]: WirelessConfigure: 88001003
Errors on the MBPro:
various 88001006 errors as reported by others in this forum.
Both Machines at all the latest updates; the MBPro has the new Extreme software installed from the CD that came with the new hardware.
I would welcome suggestions ...
MacBook Pro Core 2   Mac OS X (10.4.8)  
G4 Cube   Mac OS X (10.4)  

Software Update is not offering me any Airport updates on the G4 (or the Intel).
The recent Airport Update, "AirPort Extreme Update 2007-001", is of course only for Intel Macs.
They could only be "trying to use the same IP address" if they were not configured to use DHCP, but they are configured to use DHCP, and whichever connects does get an address in the 10.0.1.[2-200] range so I think that's not the problem.

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