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Hardware tokens aren't limited to wireless networks -- in fact, they operate above the MAC layer and therefore can apply to any network. I use the Mobikey from Route1. Another very-well-known token option is the SecurID card from RSA, and there are many more. The reason I like this approach is that, if I lose the token, or my password is compromised (but obviously not both), my network access is still secure. I also like service-based solutions so that I don't need to spend a lot of time administering the solution.
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