This answer MUST get a mention:
This question used to be the highest-voted question on the Unanswered tab, by a factor of about 3, until Kyle Hale solved it with his first (and so far only) post on SFF. He's earned more rep from a single post than anyone else on SFF, by far, and this answer has earned more rep in bounties than any other answer on the SE network! The answering of this question was such a landmark in the history of the site that it inspired its own blog post.
Although I'm not personally a fan of Star Wars, there have been some exceptional answers in this tag (along with a lot of very bad questions and answers, admittedly) in the last month, including the following gems from DVK:
In the obligatory 'tooting my own horn' section, I'm going to mention a couple of answers into which I put an enormous amount of time and effort without getting that much of a reward votes-wise:
This question about Tolkien generated some very interesting results; researching it, as well as reading the excellent answers from Wad Cheber and Jason Baker, taught me a huge amount:
This question deserves a special mention, as answering it enabled me to discover a new fantasy novel I hadn't heard of, which I've now bought myself for Christmas and started reading:
(So answering questions on works you've never read can serve a practical purpose as well as helping others!)