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FactCheck.org:

Republican presidential candidate Sen. John McCain has said that the major tax cuts passed in 2001 and 2003 have "increased revenues." He also said that tax cuts in general increase revenues.

That’s highly misleading.

In fact, the last half-dozen years have shown us that we can't have both lower taxes and fatter government coffers. The Congressional Budget Office, the Treasury Department, the Joint Committee on Taxation, the White House’s Council of Economic Advisers and a former Bush administration economist all say that tax cuts lead to revenues that are lower than they otherwise would have been – even if they spur some economic growth...

Capital gains tax receipts did increase greatly from 2003 to 2006, but the CBO estimates that they will level off and decrease in the next few years. The growth overwhelmingly resulted from a sharp rise in corporate tax receipts, the cause of which is a topic of debate.