Google Analytics Blog recently reported a new benchmarking section which is live now in Google Analytics. If you opted in to this particular service, you should be able to find it in your site stats navigation at Visitors -> Benchmarking. You will be able to view a number of charts from sites of comparable traffic, so that you can find out if e.g. whether your site visitors stays longer on pages than average, or if they visit more pages than average. Your own site’s traffic will be displayed in the usual blue colored line, whereas the traffic of all the other comparable sites (e.g. competitors) is displayed with a gray line. (Please note that the individual charts graphics use sub titles, not headlines)
Also, a category list on top offers items like Entertainment/ Music or Society/ Education which you can pick from to restrict the charts to compare to sites within that category only.