Do you know of a graphing library similar to Google's Annotated Timeline( http://code.google.com/apis/visualization/documentation/gallery/annotatedtimeline.html) that can be updated in realtime with new data points? Either javascript or flash is ok.
Thanks!
A lot of the bigger charting libraries/toolkits will let you update the datasets in 'realtime', if by realtime you mean that you're able to call a function on the chart to introduce new points.
Check out:
OpenFlashChart2 supports this, by means of JavaScript or a configurable polling interval pulling data from a backend script.
You could also try FusionWidgets v3 which gives you a choice of several types of real time charts which are extensively customizable and very easy to handle.