I've bought the Datlow, Link and Grant Year's Best (formerly the Datlow and Windling) since I got into writing, and I buy it still, regular like. I find it a useful sampler, plus, I've always liked the Edward Bryant film write up, though in recent years it hasn't been as good as it once was, or so it seems to me. Also, I'm pretty partial to the Congreve and Marquardt Australian Year's Best books, because the reprint me, yes, and because the books are also a good introduction to the independent scene down here. Locally, I buy the Peter Craven Year's Best essays off and on, but only if something grabs me.
So, what about you?