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Google's proposal is to insert a new token after the hash mark. That would alert crawling technology that the following information creates a new page state, often by going to the server to update only part of the page content.
The new token Google proposes is an exclamation mark added immediately after the hash tag, so a stateful AJAX url might look like this:
This approach would allow stateful AJAX urls to be shown in search results. More detail is available in the Google Webmaster Central Blog article [googlewebmastercentral.blogspot.com]