I don't know about Linksys specifically but most of them require drivers. This is one area where I really wouldn't go. USB wireless adaptors are notorious for wrecking your OS when it comes time to update or even, if you're unlucky, as soon as you plug it in. They're all terribly supported and incredibly unstable so, if possible, get the appropriate AirPort (or Extreme) card for your machine and save yourself the heartache. 🙂