javascript graphing library

I'm looking for a nice graphing library for JavaScript that can handle the following types of graphs:

Line Graphs
Histograms
Scatterplots
Motion Charts

I've tried Google's Chart Tools but they don't seem to have a nice histogram chart (nor can I get their motion chart to work properly, even served off my Apache web server).

I'm hoping that there's a decent library out there that can support all of these, however if I must, I may include 2 different libraries (looking at Google Chart Tools, gRafael, flotr, and rgraph right now - none of which seem to include ALL of the requirements I have).

Solution

I'm surprised no one has mentioned JQPlot yet. I'm not entirely sure it will do everything you need, but it's a very, very capable library. It's in jQuery, just to note.

Demos of JQPlot here

JQPlot can fit all your needs, it seems:

Line Graphs JQPlot supports these just fine, as you'd expect
Histograms Histograms are just bar charts, so that should be ok. A colour histogram would just consist of 1px wide bars
Scatterplots Scatter plots are also fine
Motion Charts I think you mean bubble plots, which JQPlot also does