The Global Wage Report 2012/13 from the International Labour Organization has this useful figure comparing minimum wages across high-income countries.
The vertical axis shows the minimum wage converted to dollars (using the purchasing power parity exchange rate). By this measure, the U.S. minimum wage is middle-of-the-pack, above Japan and similar to Canada, although well below the United Kingdom, France, Australia, and Netherlands.
For a post on how the minimum wage affects employment and prices, see my February 2013 post on "Minimum Wage and the Law of Many Margins." For a post on proposals to raise the minimum wage, see my November 2012 post on "Minimum Wage to $9.50? $9.80? $10?"