I'm very interested in this as well. I have always wondered why the scrolling is choppy and vsync doesn't seem to be honored; while investigating I noticed that Xorg is indeed using fbdev!

I'm going to take a shot at getting a real video driver up and running.

I notice the Meego 1.1 build for the n900 includes:

xorg-x11-drv-fbdev-sgx

I'll try to get it running under Maemo.