What kind of documentation are you looking for?

- there is a makefile usable under mac/linux in the root directory of the .net client, called makefile. Assuming you have MONO installed, that should just rebuild everything on your system

- if you go to the LIB/Release directory and type MONO readsample.exe http://www.google.com/calendar/feeds/default <username> <password> that should show you your current calendar entries...

Is this sufficient to get you started? To then look on how to connect to blogger, you pretty much take the blogger sample code (which is the only VB.NET sample) and the calendar sample code and just port the VB sample code to C# so that you can run it under MONO. You should also look at the unittests, there are tests for blogger written in C#.

Let me know if that helps...