Python Pandas + Rickshaw.js = BearCart
Pandas Series and DataFrames with DatetimeIndex goes in. Rickshaw.js comes out.
Bearcart is a small library for creating Rickshaw visualizations with Pandas timeseries data structures. It has a simple API, a number of plot types, and some really nice legends and tooltips thanks to the folks at Shutterstock.
Bearcart uses Jinja2 templating to create the output, and the files are simple HTML/CSS/JS that can be manipulated after the fact for your application.