Just yesterday, we told you about the beta release of the SDK for Windows Phone 7. The chaps at I Started Something provides us with a video walkthrough of the emulator along with a preview of the assorted ringtones that will be available on Windows Phone 7 devices. The biggest improvement appears to be with the speed and responsiveness. There is also a significant amount of polish to the OS. Things seem to be shaping up quite nicely, don’t you think?