One of my favorites is the animated cone graphics from the National Hurricane Center. This let's you see how the forecast track is changed over time and gives you an idea of how accurate their forecasting is...
http://www.nhc.noaa.gov/archive/2011/graphics/al09/loop_5W.shtmlThe above link is for Irene, but from any storm's page at the NHC, you can pick on "storm archive" for that storm, then pick "graphics archive", then "5 day Track Forecast..."