Google’s new GData Objective –C Client Library adds support for the Google Contacts Data API and YouTube API. So essentially, any applications written in Objective-C (including those created for the iPhone) will be able to take advantage of features such as uploading video to YouTube account or directly editing their Google account contacts.

According to Google blog post, GData Objective-C Client library is 100% compatible with the iPhone SDK.

"Perhaps you want your iPhone software to send photos to a Picasa Web Albums account, or keep a journal of phone calls automatically in Blogger. Maybe your iPhone application accesses a database of information from a Google Spreadsheet or from Google Base. With the Google Data APIs Objective-C Client Library, creating software for these tasks is straightforward."

"If you are writing iPhone software, just drag the “GData Sources” group folder from the GData project file into your iPhone project, and use the GData APIs as you would when writing a Mac application."

More information on GData Objective-C Client Library can be found at the project page. [Via iPhone Atlas]