Cumulative reputation graph
Could you please add cumulative reputation graph to profile? I mean: x-axis - time, y-axis - reputation the user had at that time.
Sometimes it would be useful to see what was the reputation level of particular user in particular time (e.g. what was his reputation when he posted this answer or question). Also it would be interesting to see how your reputation growed through time. The scale of Y-axis would of course need to be changed according to particular time interval selected.