Debt & Deficit Primer (part 1). Recent visuals of US government debt and deficits over time, with explanation.
Debt Clock & Reasons for US Federal Debt Growth (Peter G Peterson Inst)
Lesson in Measuring Federal Debt (Federal Reserve)
Interest Cost on Federal Debt (Federal Reserve)
Top 20 Charts (Committee for a Responsible Federal Budget)
Fiscal Monitor- Charts & Reports by Country (International Monetary Fund, current)