Google has published a directory of their beta APIs. The only one I care about right now is the Google Calendar Data API. From there, I found the .NET Client Library which led me to Google.GData.Calendar.dll and Google.GData.Client.dll. Those two DLLs really made my night!
But wait, that’s not all! Google provided a mobile version of the library! It is slightly different than the normal library. I noticed a few of the constructors were different than in the documentation and some properties were read-only. Nothing too serious.
As a last bit of icing on the cake, here is the NDoc documentation for the Google.GData Libraries.