The boys at A Hamburger Today have let us know that May is National Hamburger Month. This month-long celebration is being sponsored by White Castle (we hear they know a thing or two about burgers, having been in the burger biz for 85 years). If you feel like commemorating the occasion, you can always send someone an e-card, but we recommend celebrating the right way -- by diving right in to a big, juicy burger at the establishment of your choosing (the one pictured is from P.J. Clark's, in case you were wondering).
We've also heard rumors that May is also National Barbecue Month, National Egg Month, and National Salad Month (presumably to counteract some of the cholesterol).