Hillel Levin has put up a self-described "big post" on gay marriage. An excellent post, all around (but see the post of Prof. Ribstein as well!). Kind of reminds me of my own uber-post on gay marriage, though Prof. Levin takes it from more of a legal standpoint while I operate on the normative side of things.
Also, if you're in the market for a breadbasket of gay marriage cases, I've got 'em here, with analysis and opinions out of New York, Washington, Massachusetts, Indiana, Federal District Court (M.D. Fla.) and the US Bankruptcy Court. Makes a great gift for the law geek in your family (who, if you're reading this site, is probably you. So treat yourself.).