To get it go to:
http://code.google.com/p/google-gdata/source/checkout
and follow the instructions.
Inside the clients/cs/lib/release directory you will find a setup
program that you can run, if you like to. The setup program gives you
VS2005 project templates for a number of Google Services, including
Google Contacts.
Please report issues you have here:
http://code.google.com/p/google-gdata/issues/list
The latest release notes are here:
http://code.google.com/p/google-gdata/source/browse/trunk/clients/cs/RELEASE_NOTES.HTML
Regards
Frank Mantek
Google