this one on a number of blogs and it sounds like fun. It's been years since I've read any "true" Holmes and this seems like a good opportunity to jump back in.
The challenge asks readers to read and review as many of the stories as you can. There are 9 "books" listed...half of them are the ~novel length stories and the other half are the short story collections. I'm not sure which I'll read or how many, but I have been sitting on a collection of Holmes stories for many years without ever reading all of them.
Wish me luck and keep your eye out for Holmesian reviews in the coming months. :)