If you are with AT&T and have a Netopia modem in your home and you up grade to Apple OSX 10.6 you will have problems that AT&T will not help. They will help for a fee of $99.00 but that is unfair as it comes. I have spent hours upon hours with the biggest idiots on the planet at AT&T. They have not updated their techs so you have to go to a dept. called Support Plus who charged for everything, if you can get them on the phone. Well it is Sunday so I will have to wait till Monday to cancel my account with At&T and look for another company that may or may not know what they are doing. I have had great wireless for my computer but when something goes wrong the folks at At&T are not there to help you and seem to be proud of the fact. Sad company and I even have stock with these idiots.
Best to not buy Snow Leopard upgrade for your Apple till people like AT&T get their stuff together.
Good luck folks