If you're interested in the differences between the tax plans Senator Obama and Senator McCain have proposed, you'll probably find the Washington Post's Obama and McCain Tax Proposals as informative as I did.
I'm particularly interested in the fact that McCain's tax break percentage increase as income increases while for Obama tax breaks increase and income decreases. Given the increasing disparity in wealth between the extremes, I believe Senator Obama's plan is the most equitable given this data.
One other fact I haven't been able to find yet is how Senator McCain plans to finance his tax cut. Folks used to complain about the "tax and spend liberals". I think it's time they started worrying about the "borrow and spend conservatives" who have driven up the debt and deficit over the past eight years.