for share image the best chois as for me woudbe dd image from SD card :
unplug your sd
plug it into cardreader
dd if=/dev/sd/\partition /\ of $HOME/sid_n770.dd
bzip2 -9 $HOME/sid_n770.dd

and some question
did it use nokia`s kernel or rebuilded ?
did uinput (need for mouseemu) work ?
iceweasel workable ?