Google Data Api's posted a few updates today, a few of which I've really been looking forward to; Community Search, Retrieving a user's recently uploaded photos, Retrieving recently added comments for a particular user, Searching a user's photos, Filtering by tag, Uploading non-JPEG photos, Downloading the original photo.
(my fav) Downloading the original photo: You can now download the original
photo, including all EXIF data. This is accomplished by retrieving the feed
imgmax=d query parameter and value This will return a feed where
media:content elements reference the original downloadable image.
It's nice not having to use a backdoor for this anymore