Look no further.  The Gadgeteer core library documentation is posted on the Gadgeteer community site at http://www.netmf.com/gadgeteer/docs/gadgeteercore/index.html. 

This covers the namespaces:

• Gadgeteer - including the Color, Mainboard, Picture, Program, Socket, StorageDevice and Timer classes.
• Gadgeteer.Interfaces - including AnalogInput, AnalogOutput, DigitalInput, DigitalIO, DigitalOutput, I2CBus, InterruptInput, PWMOutput, Serial and SPI classes.
• Gadgeteer.Modules - including Module, DaisyLinkModule, DisplayModule, DisplayModule.SimpleGraphicsInterface, and NetworkModule classes.
• Gadgeteer.Networking

Check it out, and if you have any questions, let us know in the Gadgeteer forums.