It didn't work for my N1. I enabled the app, brought me to the 2nd window where I also enabled it and let the phone shut down and nothing, I had to use the power button to turn the screen back on. Back to nolock.
It was the way I installed it, working now but after installing gingerbread the trackball wake no longer wakes the screen, have to use the volume key. Still very effective but like the trackball wake.