By "fair" tax I'm referring to the national retail sales tax promoted by
www.fairtax.org
Essentially, the repeal of the current multi-tax system (not just income tax but also the entire range of punish/encourage tax scams from gasolin taxes to luxury taxes) and the abolition of the IRS altogether, to be replaced with one 23% sales tax on all retail purchases. Many economic departments (including Harvard, but look at the site for a list) have said it would work revenue neutral and retail prices at the counter would not rise.
It's a MUCH MORE progressive tax than the current system. That's why I figure you'd like it.