Deskbound: Standing Up to a Sitting World by Dr Kelly Starret is highly recommended for anybody who sits a lot.
In this beautifully illustrated book, Dr Kelly Starret shows you how to properly brace your spine while sitting and standing and how to successfully make the migration to a standing desk, or simply do less damage to your body while sitting.
The book also contains a host of body mobilization techniques as well as basic maintenance prescriptions for your desk-bound body.