Google announced the Analytics Data Export API some days ago, thereby making it much easier to get analytics data for a site. The API debuted with Java and Javascript client
Check the trunk of Google's .NET library, they have added Analytics support.
Also check their groups post on this:
http://groups.google.com/group/gdata-dotnet-client-library/browse_thread/thread/2d2eec9103b731c6
and
http://groups.google.com/group/gdata-dotnet-client-library/browse_thread/thread/70c6638734823b8d