Free 10-day Buddhist meditation retreats, incl. room & board, at one of the many Vipassana Meditation Centers world-wide (http://www.dhamma.org). Very old-school; the real deal.

The Goal, by Eliyahu Goldratt (http://www.amazon.com/exec/obidos/ASIN/0884270610). Most real-world systems have a single constraint that limit the system's ability to achieve goal units. The best way to improve the system is to (0) define the system's owners and their goal for the system, (1) identify the constraint (2) improve the situation at the constraint in a way that does not require significant investment; (3) if the improvement resulting from the previous is not sufficient, decide how to improve the constraint in a way that does require significant investment; (4) subordinate everything else in the system to the decision arrived at in the previous step; (5) start over at step 1.

The Game, by Neil Strauss (http://www.amazon.com/exec/obidos/ASIN/0060554738)