The principle is the same as the previous version: Create a beautiful 3d bar chart. But this time, we don't create a "stacked" one (since animation would be hard), but several bars placed under each other. When hovering, the animation shows and the bar will grow to the appropriate size.
Stock Chart is a powerful application that lets you forget about most of the boring parts in building complex statistical systems. It has built-in period and data set selection tools, and can group data to longer periods. This enables you to make drill-down charts without any additional coding, using one data file only. Click on "MAX" button below the chart and you will notice that the chart displays monthly data. Click the "1 Month" button, and you will see that the chart now displays daily data. This is done without any data reloading!
Timeplot is a DHTML-based AJAXy widget for plotting time series and overlay time-based events over them (with the same data formats that Timeline supports).
jqPlot is a jQuery plug-in which is used for data visualization and it provides easy customization of charts. It is licensed under MIT and GPL2.
Making good-looking graphs shouldn't be hard. Morris.js is a lightweight library that uses jQuery and Raphaël to make drawing simple charts easy.