http://www.treasurydirect.gov/govt/reports/ir/ir_expense.htm
^^This link provides the monthly interest debt for FY2008; the low is $19B for the month of September ‘08, the high so far (June ‘08) posted $110B. The total for the year (October ‘07 – September ‘08) is $451,154,049,950.63.
Divided by 365 days, that averages out to be ~$1,236,038,493.02 per day (over $1.2B per day).
Over $51M per hour
Over $858,000.00 per minute
my head hurts now