The beer-for-charity movement, like the microbrew phenomenon that preceded it, is different depending on where you look. In Houston, for example, where a group of giving-minded bar owners opened a place called the Okra Charity Saloon last month, patrons get a vote with every drink as to which charity should receive the next month’s profits. A project in Melbourne, Australia, plans to put geography into the equation — sale of a beer from Africa, for example, will be linked to microloans or charities in the country of the beer’s origin.