I've put together an interactive, open-source JavaScript charting
library which is compatible with gviz. It can both read in DataTable's
and be instantiated as a Google Gadget (e.g. for use in Google
Spreadsheets).

For some demos and documentation (including gviz documentation), see:
http://www.danvk.org/dygraphs/

Key features:
- Plots time series without using an external server or Flash
- Works in Internet Explorer (using excanvas)
- Lightweight (45kb) and responsive
- Displays values on mouseover (this makes it easily discoverable)
- Supports error bands around data series
- Interactive zoom
- Adjustable averaging period
- Can intelligently chart fractions
- Customizable click-through actions
- Compatible with the Google Visualization API
- Intelligent defaults make it easy to use

dygraphs is still very much a work in progress, but I've found it
useful in my own work and hope that you will as well. Feedback is much
appreciated.

Issue tracker: http://code.google.com/p/dygraphs/issues/list
Source code: http://github.com/danvk/dygraphs

Enjoy,
 - Dan

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