The newest release of the .NET client library adds a lot of new goodies for you, they are listed in detail here:

http://google-gdata.googlecode.com/svn/trunk/clients/cs/docs/generated/RELEASE_NOTES.HTML

The highlights are:

YouTube support, you can search them, upload them, download them, rate them.... And there is a full blown ASP example on how to do all that, including authentication for web applications.

Google Health support. There is a nice command line tool (HealthTool) that demonstrates how you could manipulate the online data in your health profile, and of course, you could use web authentication as well. You get all that, and we even throw in a Visual Studio 2005 project template.

Google Contacts are new and improved, and so are the .NET classes dealing with those feeds.

Go and download it here:

http://code.google.com/p/google-gdata/downloads/list

and if you happen to find differences between your expectation and what the product actually does, do not shy away to report them here:

http://code.google.com/p/google-gdata/issues/list

and this includes wishes for enhancements of course.

Regards