Just finished today Nick Rennison's Sherlock Holmes: The Unauthorized Biography, which is a slightly tongue in cheek take on the famous detective that states he was in no way fictional. The author has done a fair bit of research on the political and historical goings on that the illustrious detective could have had a hand in and does a nice job of picking out supposed clues (obsfuscated, of course, by Dr. Watson) to determine what really went on.
It's a nice review of my favorite fictional detective's life and adventures, and was much more interesting to read than the biography I recently attempted on Conan Doyle (here relegated to literary agent for Watson). While revealing nothing of great surprise about the character and sticking fairly close to the canon/popular view of him while proclaiming not to, it was still an interesting game of speculation and "connect the dots".
I'm currently listening to the audio version of Laurie R. King's The Beekeeper's Apprentice, which I read several years ago and enjoyed while barely remembering a thing about it. It's such a fan fiction-y piece, complete with a Mary Sue and (eventually in the series) romantic entanglement with the detective. Despite this, it's very well written, logically constructed, backs itself up nicely with the canonical material, and is good fun. I was discussing with a friend that, as out of place and unlikely as the May-December romance is, it serves a good purpose in getting any questions about sex, propriety in the time setting, and romance tucked out of the way so the adventures can be gotten on with. Otherwise, those particular themes would have dangled like anvils around the neck of any story to come after the initial entry of the series. Further books in the series are much too good to let that stand in the way. My particular favorite is O! Jerusalem. I've just picked up last year's entry into the series (now that it is in paperback, although not in mass market...had to go with a trade, which will just mess up my shelves!) and now have to wait for this year's entry to go through its hardback cycle.