Google announced on their blog,
http://googleblog.blogspot.com/2011/10/making-search-more-secure.html
That they will now secure the searches of users logged into Google through ssl encryption. This will make it impossible to see the keyword in the referrer data. If someone is not logged in and searches the data will be received.
This should bring about a greater usage of webmaster tools, another Google product. Some have said it should not be long for webmaster tools to be integrated into analytics.