Intelectual fun:
Jared Diamon Guns, Germs and Steel - why Eurasians conquered others and not the other way around
Peter Heather The Fall of the Roman Empire - title says it all - but this one has great explanation of Roman-Barbarians relations - something like Rich West - poor immigrants now - parallels to current situation are obvious.
Lederman, Teresi God particle - my favourite popular science book about modern particle physics - what is the search for Higgs boson about ?
Just fun (assuming you've read Tolkien :) ):
Andrzej Sapkowski - Last Wish, Blood of Elves
Orson Scott Card - short stories, Ender's Game
Philip Dick - short stories like We Can Remember It for You Wholesale
Stanislaw Lem Cyberiad, Solaris