Ed sent me a Stanfords voucher at the end of the year and I recently got round to spending it.
Prisoners of Geography by Tim Marshall is a fascinating book on Geo-Politics, I highly recommend it.
London, A History in Maps by Peter Barber is a treat for map lovers, it shows the evolution of the city in a massive series of maps insightfully observed by the former chief curator of the British Library maps collection.
Unsurprisingly they both have mappy covers.