• Full support for core OpenSocial 0.8.1 JavaScript APIs
• OpenSocial 0.8.1 JSON-RPC Protocol
• Gadget views: profile, canvas, home, preview, group profile and group canvas
• Preview support for OpenSocial 0.9 Albums API
• OpenSocial extensions for Groups and Worlds, allowing access to information about groups, group members and the worlds (i.e. games) and realms (i.e. game servers) supported on Avatars United

• opensocial.requestShareApp
• OpenSocial RESTful protocol
• Proxied requests using 3-legged OAuth (i.e. gadgets.io.AuthorizationType.OAUTH)
• 3-legged OAuth for the OpenSocial RPC protocol

• The Silicon Valley Google Technology User Group (GTUG) is scheduled to discuss Java development with OpenSocial at their February 4th meetup. Two developer advocates from Google will present on the Java flavor of Shindig, as well as the Java client library which allows developers to interact with OpenSocial containers from Java-based apps.
• WeekendApps is a three-day "codefest" starting February 20th at the Google's headquarters in Mountain View, California. Developers and general social enthusiasts will form teams, brainstorm new concepts for social applications, and then design and build these apps over the weekend. On the evening of the 22nd, the teams will demo their apps and those with the most popular apps will score prizes and publicity.

• A MySpace DevJam is scheduled for February 5th in San Francisco. The event will be focused on monetizing applications via virtual currency and is being sponsored by Offerpal, which is providing up to four developers in attendance the opportunity to have their applications reviewed by Offerpal's consultant team.

• Internet Explorer 6 & 7
• Firefox 2.x & 3.x
• Safari 3.x
• Chrome

If you've thought about diving into the Google Health Data API, there's no better time to start. Today the documentation got a major face-lift. There's a slew of new content and several new pages:

Getting Started Guide
Developer Best Practices
Libraries & Code

There's also new information for third-party services and data providers.

If you've already implemented an application using the API, we'd love to hear about it. Take our survey and let us know how it went.

Updated 09/04/2008 to clarify language in the last paragraph

The Google Data team has developed client libraries in .NET, Java, JavaScript, Python, PHP, and Objective-C. With the popularity of other languages like Ruby, many developers have taken it upon themselves to build libraries for their favorite Google Data API. Here are two examples:

base4r:
A ruby gem that allows developers to create, update, and delete items using the Google Base Data API.

libgcal:
A

C/C++ library to interact with the Google Calendar and Contacts APIs.

For those of you who want to get involved in open source development, feel free to contribute to these projects or help us to improve Google's officially supported client libraries. If you're interested in starting fresh, checkout Jeff Scudder's presentation on Creating a Google Data API Client.

Hack away!

Implemented your own client? Leave a comment.

Updated 09/03/2008 to correct the name of base4r

Updated 07/18/2008

https://www.google.com/accounts/AuthSubRequest?
       next=http://localhost/authsub
       &scope=http://www.google.com/calendar/feeds%20
              http://picasaweb.google.com/data
       &secure=1
       &session=1

• Contacts Data API
  
• Calendar Data API
  
• Spreadsheets Data API
  
• Documents List Data API
  
• Blogger Data API
  

• Download the Toolkit
  
• Browse the wiki documentation
  
• Ask questions on the Apex Code developer boards
  
• Contribute back to the open-source Toolkit
  

• Extend the Reach of your Google Apps Environment with Google APIs
  
• Authenticating to Google Data Services
  
• YouTube on Your Site
  
• Creating a Google Data API Client
  

  def authenticate(email, password)
    http = Net::HTTP.new('www.google.com', 443)
    http.use_ssl = true
    path = '/accounts/ClientLogin'
    data = "accountType=HOSTED_OR_GOOGLE&Email=#{email}" \
        "&Passwd=#{password}&service=wise"
    @headers = { 'Content-Type' => CONTENT_TYPE_FORM }
    resp, data = http.post(path, data, headers)
    cl_string = data[/Auth=(.*)/, 1]
    @headers["Authorization"] = "GoogleLogin auth=#{cl_string}"
  end

import gdata.service
import gdata.urlfetch
# Use urlfetch instead of httplib
gdata.service.http_request_handler = gdata.urlfetch

• Import a user's Google contacts into their web or desktop application
• Export their application's contact list to Google
• Write sync applications for mobile devices or popular, desktop-based contact management applications

• Documentation bundled with the library, including PyDoc files and installation instructions.
• Better support for UTF-8 XML strings and the option to use alternate encodings.
• Support for creation, modification, and deletion of worksheets within a Google Spreadsheet.
• New modules for converting XML elements in the geo, media, and exif namespaces.
• New methods to simplify iterating through all of the results in a feed.

• PHP Client Library Getting Started Guide
• Zend Framework Documentation
• YouTube Developer's Guide (Developer's guides for the other APIs are coming soon.)