Today Google released new graphing features to help make trends more visible. Previously, you could only view day-to-day trends in the timeline. Now in addition to viewing the data by day,

you can now see the data by week…

and by month…

This will help you compare long-term trends and make visualizing these trends much easier. You can also use these new graphing features to compare metrics. You can compare the last two weeks to the next two weeks, or even on a year to year basis.

These graphing features are found right below the date selection tool, above the timeline, and can be found on all reports within Google Analytics.

For more information on these features you can check out the Google Analytics Blog.