It's always convenient when two different holidays that are related happen in the same month. Of course, I'm not sure why these two holiday months aren't later in the summer.
Maybe it's a Memorial Day thing. May marks both National Barbecue Month and National Hamburger Month. Mahalo has a great page with various links to bbq how-tos, bbq recipes, and where to find the best bbq in the country. As for hamburgers, Food & Wine has a recipe for an All-Time Favorite Hamburger. And here's a bunch of recipes from the Southern Food section of About.com.
There's also a new book and documentary out called Hamburger America that examines some of the great burger places in the U.S.
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