Yeah, it's pretty kick ass. HTC is releasing lots of finger friendly apps as they release new phones. Luckily the dev community is able to share them with the rest of us.

Here's a tip: when zooming in, make a small tight circle over the area to zoom into, and it will zoom in all the way to fit the size of the circle you draw.

So a small tight circle zooms ALL the way in, in one gesture, and a larger one just a little: enough to fit it in the screen.