Yochay Kiriaty has a blog post about developing for the Windows 7 task bar.
Yochay goes one by one on the demos. The included demos are:
- Web Browser
- IM Client
- Document Reader
- Main Demo
The main demos demonstrates how to handle a multitude of basic functionality.
The samples and .Net libraries so you can develop against it can be found over at http://code.msdn.microsoft.com/Windows7Taskbar/Release/ProjectReleases.aspx