The other way of course is to arrange some kind of vote-twinning.

So if you like Obama but live in some state where it is inconceivable that he could win, you get in touch with someone in a swing state who prefers Obama to McCain, but who fancies registering a vote for Nader. And you agree that they vote for Obama, and you vote for Nader.

You could do it via the Mudcat with someone with whom you've been arguing about these things. Of course you'd need to trust each other, but what's wrong with that?