March 5, 2009
You'll see that an exception to the deprecation policy will be features marked "experimental." This label is for experimental features that the deprecation policy does not apply to and therefore they can be changed or removed in the future, even if the deprecation policy applies to the rest of the API. You may have seen in the AJAX Search API reference that we have a few such features already, so we wanted to make sure you knew which ones those were.
The current experimental features include all of Book Search and the "image type" restriction of Image Search. We've done our best to clearly mark all of these as experimental in the docs.
As always, please let us know if you have any questions or comments.