The season finale of Sherlock has got me desperately lapping up angsty and/or hopeful post-Reichenbach John/Sherlock fics. If you are experiencing a similar reaction, read this fic at once:
My Dear Watson by saeng [PG-13]
Summary is spoilery, so highlight to view: Post-Reichenbach. Sherlock's dead, and John finds himself questioning his own stability when he discovers a note taped to the bottom of his mattress, propelling him on a hunt for answers that may not exist at all.
It is perfect, and also interactive (in that there are Google Maps links to the locations, so you can explore them on your own).
Oh, hey, and because it needs saying: British TV >>>>> American TV
Also, after reading all of these fics, I will be really disappointed if in series 3, John doesn't punch Sherlock in the face immediately.