I wanted to introduce our new 2D game development toolkit/sdk called NAS2D. You can read more about it at http://nas2d.newagesoftware.org.
A little about NAS2D:
NAS2D is an open source, object oriented 2D game development framework written in portable C++. It was designed to make the development of games easier by providing a high-level interface. It handles the low-level tasks of setting up the video display, input, sound mixing, file loading, etc.
One of the primary goals of NAS2D was to be cross-platform. A lot of effort has gone into the code to make it as platform independant as possible. The few areas that are different from platform to platform are completely hidden from the interface and is virtually transparent to the user.
NAS2D is powered by several well known low level libraries including OpenGL, SDL, and PhysFS to name a few.