Fan art: Grammar pedant, Sherlock Holmes. Sad Sherlock from Blind Banker.
Calculations: How old are Sherlock and John? (For all your fan fic and fangirling needs).
A study of fan fic, i.e., statistics.
Because I have missed Mycroftian considerations -- confess, you have also! -- here's some of them from the Mycroftian part of our fandom:
The Mystery of Sherlock's Mummy.
Under the spoiler zone of series 2 (and possibly The Hobbit)
I've probably posted this before, but it's brilliant, so... that Mycroft is a sly old fox in a three-piece suit, so he is and the reply from Norwood Builder.
Reichenbach theory: Nothing is what it seems.
TV spot for The Hobbit -- video embedded within that link.