1. Flow by Mihaly Csikszentmihalyi (http://tinyurl.com/33kv6te) - fascinating look at the author's theory of Flow, the state of total absorption that accompanies total concentration - so called "optimal experience". Anyone who programs knows this feeling. Really excellent book.
2. Stumbling on Happiness by Daniel Gilbert (http://tinyurl.com/38lvdzc) - not the self-help book it sounds like, but an interesting look at why we're so bad at working out what will make us happy.
3. The Tiger that isn't by Andrew Dilnot (http://tinyurl.com/38hntqx) - interesting guide to our instinctive interpretation of statistics and how the media manipulates it.
4. Bad Science by Ben Goldacre (http://tinyurl.com/3yk8woz) - at once amusing and horrifying look at various aspects of pseudoscience, especially as applied to healthcare.
1. Anything by Iain Banks, especially the sci-fi.
2. If Nobody Speaks of Remarkable Things by Jon McGregor (http://tinyurl.com/3496d34) - worth reading just for the language he uses.
3. American Gods by Neil Gaiman (http://tinyurl.com/3xyr65w) - great fantasy with a darkly humorous side.