Incipio's NGP Matte has changed a bunch from its original iPad version to the iPad 2 edition ($35). Made of a semi-soft plastic -- NGP stands for Next Generation Polymer -- the case is flexible enough to be easy to put on but otherwise maintains its shape. It's thin and light, with cutouts for all of the openings along the edges of the iPad 2, plus full top and side button coverage. Like many of Incipio's cases, NGP is available in a variety of colors…