And for you Sherlockians who still just can't get enough, there is "I Hear of Sherlock Everywhere," the definitive Sherlock Holmes podcast and website at the intersection of news and popular culture:

http://www.ihearofsherlock.com/

I can also recommend the two novels by Anthony Horowitz, House of Silk and Moriarty. These are the only two contemporary works to earn the seal of approval from the Conan Doyle Estate. And Horowitz, creator of the beloved ITV British detective drama "Foyle's War", knows a thing or two about mystery and suspense ;)

But I don't think you can really discuss Conan Doyle without commenting on the influence of Edgar Allan Poe. And how even to this day in internet forms like creepypasta and #nosleep, Poe's innovations continue to, ahem, haunt us.