Internet Tablet Talk introduces KidSketch, a simplistic graphics animation app on Nokia 770, but Simon Budig hints at bigger things coming: Gimp on 770:
Gimp maintainers (Sven Neumann and Michael Natterer) both were lucky bastards at the Guadec and both won a Nokia 770. I am fairly certain that they will hack on that when they have the device in their hands. However, this should not stop anybody from diving in the code and get familiar with it.
On the multiple mouse buttons: Since Gimp is also intended to be used with graphics tablets as well most functions are accessible with a stylus. You’ll miss some convenience things (like middle mousebutton panning) but these should not be essential.
So yes, I definitely believe that it is possible to have Gimp on the Maemo or GPE platform, it even should be possible to nicely integrate it with Hildon, although IMHO a nicely done pure GTK+ embedded interface has bigger chances on getting accepted for Gimp CVS.