To be honest, I treat credit as debt, so always ensure that whenever I buy on credit, it's a debt I can manage simply and easily.
There's an nice extension of the argument here:
» My Credit Card Strategy*on*Blueprint for Financial Prosperity
where the guy argues for using different cards with different strategies. I already use my debit and credit cards very different, with the debit card for regular monthly expenses, and credit card for anything on top of that.
What's really interesting is the idea of using *different* credit cards for different strategies:
samerwriter » Blog Archive » Year-To-Date Credit Card Rebates
Something I don't quite understand, though - although he mentioned rebates, I can't find any mention of actual debt generated.
For example, those Amazon cards have a very high APR, and if you get suckered into paying that, those gift certificates just won;t cover it.