More to box's point....its not the debt that matters...a certain debt level is actually >good< to carry...its the economy's ability to sustain that level of debt.
In that light..our debt is "within acceptable limits". It may be high in sheer dollar terms...and even high in terms of overall leverage...but we maintain the ability to service that debt.
And our credit is still decent...thus we can continue to cycle debt.
If we hit triple c in the world credit market...we're in trouble.