WiFiFoFum is free (from Handango) and should work. Pocketwarrior, also free, may also work. PocketWinc should (I have all three working on a 3970). Be careful when upgrading from PocketWinc 1.3 to 2.0 -- you may have to uninstall and reinstall 2.0 if your network card cannot connect to your AP.
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