Darn - books with green covers don't sell.
My first novel Vanishing Act has been trickling along. Until now I had put it down to the Long Tail (oh, and the fact that I haven't really been pushing it). But now, thanks to this interesting video - all is revealed. It is because the cover is green.
If there are any designers out there who would like to redesign my book cover - feel free to contact me.
Or buy the book and prove this guy wrong.