http://www.philipk.net/tutorials/ndo/ndo.html
It's pretty easy to install in photoshop... just unzip to the root of C and then load the action inside photoshop. The tutorial takes a moment to wrap your head around (not super intuitive) and if you're using CS5 there is a bug with the transform button.. but you just leave the tool, press Ctrl-T make your transform(end by pressing 'enter'), and then reopen the tool and it'll catch up. Same thing for incidence, just click the incidence then rather than move it, just press enter and then do as i say above.
Other than the two bugs, it's pretty awesome.. since it's FREE! pretty standard method of making a normal map in photoshop, but the nice feature is that has all sorts of automated sliders which if i were to do this manually (and I have.. well similar) it takes forever
