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Has anyone tried a USB to ethernet cable for the MBAs? Do you need to install drivers for them or do they work automatically?

Apple makes them, so there's no problem.

It says on the auction you linked to: supports 10.4 (I assume that's 10.4 and up) and comes with a driver CD, so either way it will work. My guess is that the driver CD is just for Windows 98, 2000 and ME.
 
The link you provided is just a USB to Ethernet adapter and not the whole cable like you mentioned in your post. I have not tried that one in particular. I do have a D-Link DUB-E100 USB to Ethernet adapter that I was not able to get working in Lion. I do not know if it works in Snow Leopard since I just got a MacBook Air and never tried it. I ended up getting the Apple USB to Ethernet 10/100 adapter and it is working as designed. I do plan to get a ThunderBolt to Ethernet 10/100/1000 adapter whenever those become available. The Sonnet ThunderBolt to Ethernet adapter I saw a picture of was very large and ugly so I am hoping that Apple will come out with one.

It says on the auction you linked to: supports 10.4 (I assume that's 10.4 and up) and comes with a driver CD, so either way it will work.

Just because it supports Mac OS 10.4 does not mean that it will support 10.5, 10.6, or 10.7 since the drivers can often be different. Assuming that it would work would be a bad assumption if you asked me. Especially with the 64-bit changes introduced in Mac OS 10.7.
 
Just because it supports Mac OS 10.4 does not mean that it will support 10.5, 10.6, or 10.7 since the drivers can often be different. Assuming that it would work would be a bad assumption if you asked me. Especially with the 64-bit changes introduced in Mac OS 10.7.
For that reason; I agree with you :p
 
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