whoa.... many months and some butt-ugly sketches later my DSi is back on the couch and I have to admit we have still a love-hate relationship.
Hate because the Dsi doesn't warn you when the battery is empty... which means you doodle and doodle and out of the blue that thing shuts off and you work goes straight to hell.
Nevertheless... the friendlly customer support helped me a lot and I finally got the online AA-Version which includes the option to export files. Yes... if you want AA and the export option buy the game ONLINE in the DSi ware store.
(it's cheaper anyway...)
I guess I'll be redoing Bao in Photoshop but my DSi is nice for concepts on the road, couch, wherever you want to paint with colors. You have only one layer and I still miss Cyan in the color palette but it's decent and I have three AA concepts I 100%ly redo in big and pretty.