So I spent several hours struggling to get wifi going on my otherwise perfect Compaq C700. Then I stumbled upon the following tutorial:

http://quilombo.wordpress.com/2008/01/09/atheros-ar5006eg-in-ubuntu-710-gutsy-gibbon/

I followed the  steps he outlined and bingo, I was up and running with wifi in a few minutes.  I strongly recommend checking this out if you've had problems with wifi on the C700.

There's only one caveat; the link he provides to the Atheros download page now has newer versions of the drivers. You'll need to scroll down a bit to find the 6.x version drivers he recommends (in theory it should work with the newer driver versions but I haven't yet tested that myself).