Pintprice.com tracks beer prices around the world by letting people enter in the local price of pint. With entries on just about every country, and conversion to three kinds of dollars (US, Canada and Australia), Pounds, and Euros. So some of the data looks a little suspect (like where are the $2.50 beer is Washington DC)*, but overall a few lessons can be learned.
First, beer is cheapest in African countries. Can anyone confirm the sub $.50 pints for beer in Ethopia?
Second, beer is more expensive in out of the way place or expensive European countries. Also I think you should not drink beer in France on average $8 a pint, drink wine instead.
This project reminds me of the Big Mac index. This index created by the economist compares Big Mac prices in different countries to find the relative difference in prices and predict when exchange rates are out of whack. By comparing the prices of the same good in two places you can get an idea of purchasing power parity (PPP), which is the difference in prices between two countries. The reason the index works is that everywhere the Big Mac is two all beef patties, lettuce, cheese, special sauce, on a seaseme seed bun.** Could the price of a pint (POP) work for PPP, probably not since I don’t think Costa Rican ($1.32) beer is the same quality as a Czech ($1.89) beer (trust me I have done the research). That's apple and oranges or Bud and Budvar.
* actually cheap beer can be found at the Toledo Lounge in Adams Morgan
** except India, where it is made with chicken