released photographic light meter version for Nokia N810 as well
I have been written about n900 version here
it turns your N810 into photographic light meter: calculates aperture and shutter settings, depending on ISO, aperture and shutter
I use it a lot when do photos with cameras which does not have a light meter. These are mostly film cameras.
and this is a link to the maemo talks thread
enjoy the software and make good photos!
and do not forget your old good friend -tablet Nokia N810