Maybe it's because I took up pipe smoking again, but for some reason I'm suddenly on a Sherlock Holmes kick. I took down my old volume of the complete stories, and re-read all the way through, from "A Study in Scarlet" to "The Adventure of the Retired Colourman."
Still not enough, so I re-read the three Nicholas Myers books, and, still not satiated read "New Sherlock Holmes Adventures" (now re-titled "The Mammoth Book of New Sherlock Holmes Adventures") -- highly recommended: very well written adventures by various authors, almost indistinguishable from the original Doyle (Watson) tales.
And, worried I'd run out of new adventures, I've just ordered two books: "The Secret Notebooks of Sherlock Holmes" and "The House of Silk."
There's lots of new Holmes stuff available on Amazon, but do read the reviews, as apparently not all are written up to the standard of the master himself.
Speaking of whom, did you know that Arthur Conan Doyle is widely believed to be responsible for the Piltdown Man hoax? Seems he was mad at the scientific establishment for not believing his psychic experiments to be valid, so he set out to get even. That would make for a great Holmes case, too!