Drawing rectangular sprites with a lot of whitespace that get’s cut away through alpha-blending can be a waste for big, static, background elements. PolygonSpriteBatch is here to safe the day. Bach, Shiu and Obli worked on integrating it after a quick design round via Skype/Google Docs. A PolygonSprite is made up of vertices that form a polygon instead of a rectangle. This allows you to more tightly fit the geometry to the relevant portions of the source image. You can find more information at http://www.fainted.dk/?p=142, the new classes are in the latest nightlies.