The current version of dygraphs is 1.0.1. Most users will want to download minified files for this version:
To generate your own minified JS, run:
git clone https://github.com/danvk/dygraphs.git ./generate-combined.sh
This will create a dygraph.min.js file in the dygraphs directory.
You may also download files for previously-released versions:
See Version History for more information on each release.