Thanks for your input guys.
The project is actually a progress-thing where my wife gets more and more pregnant. Well, not more pregnant, but bigger and bigger
And i took pictures at the same spot almost every day and it would be very nice to do a movie where i add all those images to the timeline with a relative slow dissolve between all images.
Therefor it would be most appreciable if all images have the same centerpoint and tilt. Her bellybutton + left eye or something.
It doesnt matter if the result in some images would be that there is empty background at the top or bottom as im going to do a little bit of zoom in the movie anyway.
I thought for a second that CS3 was able to help out with this, but i've tried the different photomerge-functions without any luck.
Then i figured that some astro-photographers usually takes a lot of images and then (as they say) "stack the images". Im not sure how that stacking is performed, but i would be surpriced if all images are manually fitted. My guess is that there is some kind of automatic function that recognise similiarities in the images and position them ontop of one another.