I think federal e-filing might already be free, actually. I've been using TurboTax for the past couple of years to file online, and they've always charged a filing fee... until this year. I did not have to pay to file my federal taxes, though I did have to pay to file my state taxes, but they didn't jack the price up on the latter (not as far as I can tell) so it's not like they're making the money elsewhere.

What I did notice, though, is that the new free filing no longer has all the help functions that their website used to have.