The graphing part is pretty amazing.

Yep I agree, the graph is very impressive. This is the first online graphing tool that is very usable and provides a decent level of interactivity without loss of responsiveness. Google again leading the way with web 2.0.

Google is slowly taking over all aspects of life. Sure, it's great now, but what happens when they unveil their sinister Phase 2? I'm thinking of calling that "V for Vendetta" guy to help take them down.

It would be nice to enter date ranges for the graphs through a field. The dragging can be imprecise.