The novel David Mitchell wrote after Ghostwritten. Can't remember the title: it's in the next room but ICBA fetching it.
On the Android chopping-board I'm still reading Dan Simmons' The Fifth Heart. Thus far (damn near 400pp in) Sherlock has rubbed shoulders with Henry James, Sam Clemens, Teddy Roosevelt, John Hay (Lincoln's old secretary) and divers other members of the American aristocracy. Moriarty's ugly head has appeared (or was it Jared Harris?), Watson & Doyle have been dismissed as fabulist hacks and the name of Hercule Poirot dropped. The plot has thickened so far you could grow Herculean leeks in it, at that.