Getting Started Guide: The Google Health Data API allows client applications to view and update Health content in the form of a Google Data API feed. Depending on the type of application you are developing (web or an installed application), your client can post new health data to a user's profile, edit or delete entries, request a list of existing entries, and query for specific health data that match a certain criteria.
Google hosts a repository of code samples, including those showing the use of CCR. The Developer's Guide includes guidance for programming in .NET and Java.
Full documentation available on Google Health API reference, most recently updated on 2008/09/02.