The Art of Electronics is great, and the book I turn to if I need to do anything involving solder. One thing I particularly like is that it emphasises the feel of particular circuits, rather than relying on calculation to explain their behaviour. It certainly helps one get an intuition of how things work.

Hmm, reminds me - I need to get around to replacing the headlight sense with a little light-metering circuit. The tough bit is making it independent of the supply voltage...