Generally my husband buys me something, often something I don't want, but last year it was a Roomba, which has Changed. My. Life. I try to think of something to tell him about, because it hurts his feelings when I take things back (but I do it anyway).
Also, I don't have to cook on my birthday, and calories don't count. This means chocolate, and usually a drive for Thai food, and since that's at least an hour each way, the celebratory meal tends to fall on the weekend closest to the actual day.
His birthday involves a present which I hope he likes better than I like mine sometimes. Last year's was a used computer game which he still spends more time interacting with than he does with me, so last year was a present win...
His celebratory meal, also eaten out, involves good BBQ ribs. I don't cook or eat pork with the exception of bacon. Bacon is too good to miss, so I just pretend it's a vegetable or something. :-)