Some Palm OS applications are very well suited to display in a Today-style overview screen. PocketPC’s have had their default Today screen program and API for a long time – Palm(Source) never included one into Palm OS, and developers thus need to live with a variety of different third-party applications.
I need to write a few plugins soon, and decided to start off with 2day. 2day’s plugin API is excellentely documented in the SDK, which can be obtained here:
Do you have SDK links for other launchers?