I was able to put the new Windows Phone 7.1 “Mango” tools through their paces and finally got an app I had wanted to write for a while into the marketplace.  Taxi Meter is an app that let’s you “play taxi” and charge based on things like time, distance, etc.  It wasn’t a complicated app to write, but I had been putting it off for a while because it made heavy use of the GPS and working with the GPS in the “old” tools was a pain.

The new Mango tools, with the Location emulator, made it a snap!  Impressive and very easy to use.  I haven’t had a chance to play with the Accelerometer emulator yet, but it appears to be just as easy based on the demos I have seen.  WP7 has the best dev tools on the planet!