[untog]

I've had great experiences with FreeTaxUSA, though they still charge for state returns. I have wondered before now why a non-profit couldn't set up an entirely free site and ask for donations.

[mandeepj]

Not sure about other States but IL has a free State tax filing site - https://mytax.illinois.gov

[Rebelgecko]

As does California, although you can't use it if you have capital gains or a few other specific things to put on your return.