I like Google Analytics and have found it to be very useful. Now Google is going to be adding some new features that will make Google Analytics even more useful.
You will be able to use Google Analytics to track site search activity.
Google Analytics Event Tracking will help you understand how people use and interact with Ajax, Flash and multimedia on your site.
There will also be Outbound Link Tracking.
Here is a Google link that contains all of the official information about all of these three new features
Google Analytics Blog: Exciting Announcements at eMetrics Today