With the latest release of the Windows Phone 7 beta emulator, a lot of changes have happened, especially for developers.

When running the emulator on a computer, as Long Zheng did at iStartedSomething, the first thing you'll notice is just how fast the OS has become. Remember, this is independent of your PC's performance (for the most part) as the earlier builds were much slower to respond. Now things like Mobile Internet Explorer and even the regular menus all instantly respond to input. Also worth a note is ringtones and alerts are now included, which while not earth shattering we do dig the overall tone/theme-- it sounds sort of futuristic, far from bombastic.

We have to admit, we're starting to get real excited, especially seeing this on some serious hardware come the fall.  Check out both videos after the jump.