Money money money

One thing I considered including on my 'things you shouldn't still be doing in 2009' list was 'using paper money.' But I've re-thought that a little bit, since I do still carry around some money, although not very much. Generally it's useful if I'm at school and want to grab a pop during a class break, or it's a good back-up currency if the debit card/credit card machine is down at a store, although that seems fairly unlikely in 2009. But until they install credit card readers on pop machines, I'll leave it off. Thank you.