- OAuth2 authentication http://code.google.com/intl/ja-JP/apis/accounts/docs/OAuth2.html
- changes http://code.google.com/intl/ja-JP/apis/documents/docs/3.0/developers_guide_protocol.html#Changes
- resumable upload http://code.google.com/intl/ja-JP/apis/documents/docs/3.0/developers_guide_protocol.html#UpdatingContentResumable
- archive http://code.google.com/intl/ja-JP/apis/documents/docs/3.0/developers_guide_protocol.html#Archives
たいへんや