I wish I had seen this thread earlier! its given me some ideas on which books to get next. My personal favorites that I come back to read again and again are ( in no particular order);
1. Beyond Brawn by Stuart McRobert,
2. Strength training anatomy by Frederic Delavier,
3. Dinosaur training by Brooks Kubik,
4. Beyond bodybuilding by Pavel Tsatsouline,
5. Starting strength by Mark Rippetoe and Lon Kilgore,
6. Practical Programming by Mark Rippetoe and Lon Kilgore.