The Mighty Bright is definitely the next generation of book lights.  I used to have the itty bitty book light and I liked it at the time.  This light is better in every respect.  It has 2 brightness adjustments (compared to 1 constant for the itty bitty).  It is also considerably brighter than the itty bitty and quite a bit cheaper.  I can't imagine there is a better book light than this on the market.  I bought a power pack also so I don't have to use batteries at home or I can pack up the batteries and take it on the road.