Ok, on further reflection, perhaps I should just say that as far as I can remember, I actually read the thread before posting my guess. This probably looks like cheating I suppose .... and if true then we ALL know that the failure of anyone to guess Ian's book simply totally disproves all psychic phenomena, now and forever more. This is just plain skeptical logic.
But an alternative explanation may exist.
This result, of course, may be simply another manifestation of my pyschic powers - the ability to temporally displace my eyesight into the future, leading me to believe I had read the thread when in fact I was posting before doing so. Alternatively, I may have projected my keystrokes back through time in order to type a response before reading the thread while reading the thread! I look forward to Ian's answers on how we might go about narrowing down the exact nature of my abilities...