Well.. there isn't some magic plan to do it..

Competing currency can range from Hayek's "The Denationalization of Money" where currency would be handled by private businesses to simply letting us use gold and silver as currency.

The logistics are not as difficult as you would think (I have a customer that pays me in Euros) so much as the laws that prevent it. For example, right now if you wanted to trade some dollars for gold, you would have to pay sales tax on that gold that you "bought" which kind of kills the deal.

This isn't some kook thing, a lot of people like Steve Forbes are really down for making the dollar at least as good as gold(but not actually backed by it).