Attached Link: http://www.smart-page.net/smartnormal/fl10.htm

it's like a poser4.bum file but with extra colour (blue).  gamers are excited about it because they believe it can add realism to low-poly models, even tho, like poser 4 bump map, it doesn't show round the outline of object.  as opposed to displacement map, which is either in-or-out like bump map, but which shows round the outline (edges).