SEO: Stopping Search Engine Indexing

If you wanted to stop Google from indexing your website (or any other search engine) you can include a robots.txt file on your server.  This file is checked by search engine bots before indexing and they follow whatever rules you put in there.

You can find detailed information on how to write your robots.txt here: http://www.google.com/support/webmasters/bin/answer.py?answer=40360