In the fury and excitement over Monday's announcement of Google providing realtime search -- timely given the Search Engine Strategies expo occurring in Chicago this week -- Google also let slip a few other features announcements, namely annotation for Google Analytics. Users can now add annotations to data points, notes regarding a perceived trend. This makes GA more customizable and help users share consensus on which data is a significant trend.
You can read about Google Analytics' new feature at Mashable. You can also view the video that shows the new annotation feature.
This is a smart move by google. This will only improve the already great analytics it provides.