definately useful for the gallery and mp3 player, games are going to be a bit restricted as it appears too laggy, and thats the camera itself not the software, so is unlikely to improve too much.
i use a similar gesture based thing (allbeit by touch) on my iphone for playing mp3's in the car.
left/right swipe = previous/next track
up/down swipe = up and down in volume
1 tap = pause or unpause
plus theres shake controls which i dont use.
makes using an mp3 in the car painless and you dont even need to look to do something so its safer as your eyes stay on the road
looking forward to seeing this in our
n95 apps