I just installed xmame on my N800 with new OS 2008, I tested "Cadillacs and Dinosaurs" rom. It ran at very low speed. Actuallly, you can't play it. I configued xmame with no rotate and double size, the scene just fit N800's, so it's a very nice display but with the fresh speed you can stand. If the performance of xmame is greatly improved, and with usb keyboard or joystick supported, it wiil be really a happy thing.

Does any emulator can run "Cadillacs and Dinosaurs" rom with full speed on N800?

same here with RAIDEN and R-Type