If that's true, and I suspect it is, those tax revenue bumps would be short lived until they have had the overall effect of slowing the economy.
Spending is ridiculous and all the Reps are to blame, with few if any exceptions.
Just some data points for reference:
Fiscal 2005 YTD Receipts 1,369,366
Fiscal 2001 YTD Receipts 1,378,023
Fiscal 2005 YTD Outlays 1,641,597
Fiscal 2001 YTD Outlays 1,240,939
Source: http://fms.treas.gov/mts/index.html