Miyagawa has released a hack to allow the Thinkpad's accelerometer to control Google Maps. You can check the source out of his svn repository.
My recommendation is to choose Satellite mode, with the 3rd Zoom level. It makes me feel like flying in the sky, just as birds. Because of Google Maps JS library prefetching images, sometimes you have a delay (latency) moving, but other than that, it is quite fantastic.