This is a map of US states renamed for countries that have similar GDPs:
(click for larger picture)
This is quite interesting to see, how California's as strong as France and Texas as Canada, for example. (However elsewhere people suggested that the raw GDP doesn't say much and per capita GDP would be a better comparison).
Some might wonder why Germany's not on the list: It's because its GDP is higher than any single US state.
(via Carl Størmer)