Google Tags
 

You could stop Google from showing any snippet of your page in the search engine results by using a “nosnippet” tag? And you can also stop Google from showing a cached version of your page via the “noarchive” tag.

http://www.highrankings.com/advisor/...g-into-google/

Google is coming out with a new tag called “unavailable_after” which will allow people to tell Google when a particular page will no longer be available for crawling. For instance, if you have a special offer on your site that expires on a particular date, you might want to use the unavailable_after tag to let Google know when to stop indexing it. Or perhaps you write articles that are free for a particular amount of time, but then get moved to a paid-subscription area of your site. Unavailable_after is the tag for you! Pretty neat stuff!