Hehehe, is the graph Javascript generating bitcoins for you? It stalled my browser totally.
Ok, some feedback on the graph: the timestamps would be better to have in a readable format.
I haven't yet seen a nice graph on any site of the bitcoin price, if I were you I would use:
http://www.highcharts.com/or
http://raphaeljs.com/or
http://code.google.com/p/flot/And I would probably have different data sets for different timeperiods: For a 24 hour graph I would have perhaps 15 min between points and for a week graph I would have 2 hours between the points in order to make the graph quick loading.
And the JSON: I don't think you should return that many data points as default, or even if a request asks for it.
Multiple requests for getting that much data would be better.
Good work.