We've moved JsUnit from SourceForge (where it's been hosted for over 8 years) to GitHub, under Pivotal's account:
http://github.com/pivotal/jsunit
The motivation is (1) to bring JsUnit development more officially in-house at Pivotal Labs, where it has a better chance of getting more attention than it has historically, and (2) to more easily allow the wider community to contribute.
Fork away!

Just a reminder to update the links on jsunit.net :)
Hah, yes. Done now.
We're actually planning on soon moving all the documentation to the GitHub wiki and shutting down jsunit.net.