I paid in quarterly taxes all of last year. I can’t recall how much I sent in now and I have to do my taxes tonight because I opted for an extension. Is there somewhere online that I can type in my social security number at an IRS website which will show me how much I paid in during the 4 quarters of 2007?

No matter what you put on the tax return, the IRS will verify the total. You could put $0 and the IRS would have no problem with it.