Actually, NO. The flat tax wouldn't help much at all with respect to the WTO and our trade balance. The Euro countries are in enough of an uproar as it is - and they are typically VAT countries.
The FairTax will greatly benefit US exporters by removing the taxes now embedded in the pices of our goods. It will also offer an attractive place to do business for organizations in other countries.
I'm not looking for any sort of national sales tax of any percentage, especially one above 20%. Nice and quick way to kill an economy.