I had no problems with Tiger 10.4.1 but when I upgraded to Leopard 10.5 Airport became very flaky on my new MacBook Pro, so I reverted to 10.4.1 for about a week or so. I then heard there was an upgrade to 10.5.1 so I loaded up Leopard again hoping things would work long enough to download the upgrade. This worked fine and I now am happy to say I have a stable system again.
Robert
P.S. The cute little application Photo Booth worked under Leopard, but did not work under Tiger. Go figure
Robert