MacOS X 10.4.8: Airport Issue

Apple has released a TechNote related to an already well described issue with airport: "AirPort does not auto-connect to existing networks after restart or wake from sleep".
This problem is affecting only Core Duo-based models (featuring an Atheros Airport chips):

MacBook
MacBook Pro (all models)
Mac mini (Early 2006)
iMac (Early 2006)

To solve the issue:

To restore the auto-connect feature:
From the Apple menu, choose System Preferences.
Select the Network pane.
From the "Show:" drop-down menu, choose "AirPort".
Make sure the "By default, join:" pop-up menu is set to "Preferred networks." (If it was set to "Automatic networks", you can set it back to Automatic after the next step.)
Select any network that shows WPA2 security and use the minus (-) button to remove those networks from the list.
Once all WPA2 networks have been removed from the list, use the plus (+) button to add them back. (You will need the appropriate passwords for the wireless network.) If it's more convenient, you can wait to re-add the networks until you use them—when you use a network, it will be added to the list automatically.
If in step 3, your default was Automatic rather than Preferred, go ahead and change your default back to Automatic.

For the other issue with Airport sensitivity affecting iMac core 2 Duo and Mac Pro, apple has so far not released any fix or explanation. It seems to be a driver issue, new drivers for the Broadcom 4328 card are not ready yet; and the temporary driver is the one designed for 43xx card found in some old eMac.