Not yet. I already have a Dingoo that plays great from composite output and already has a very good gamepad set-up. Best $85 I ever spent. Even plays NeoGeo games like Metal Slug 5 smooth with sound. I think the N900 would play NeoGeo even better, but we of course need MAME and the other arcade emulators to find out.

I still think the keyboard is an issue, just like the Droid was, since unless you want non-intuitive orientation of keys, you have to skip over a key to go left and right. This is the kiss of death for games that require fast directional change. G1 keyboard was weak, but was orientated better for games and has a little space between keys.