I've tallied totals of six major line items in the Treasury's daily statements for the first four months of this calendar year. Below is a table of the first four months for the last three calendar years for the six indicated areas of Federal spending:
The Social Security total for January 2010 is lower than the monthly trend, this is probably due to a calendar quirk in December 2009 that brought about $20B of spending forward into December. Adjusting for this would add $20B to the YTD total for 2010 and put the 2010 total at $725B.
For these four months, this adjusted YoY increase of $75B (annualized) represents about 2.1% GDP growth ($14.3T gdp).