What about raw format ? The N900 has a RAW viewer, but looks like not being able to generate such pictures.
So what is RAW viewer for ?

Other question : when using GPS tagging, I am asked to connec to the internet to find the matching town.

Is there a way to save the complete GPS coordonates without the town ?

For the moment, the GPS coords in EXIF comments look like this :
GPSinfo 4652

How to get real GPS info ?