JSDev is shiny new project from Douglas Crockford.
With JSDev it is easy to write UnitTest within file that will be tested.
JSDev uses comments and command line scripts to uncomment your test code and run tests.
This is in my opinion interesting and easy. Only disadvantage is coding within comments (or comment test code when it's ready). But if editors will understand this comment it would be really powerful.
With Node.js it will be easy to execute JS without browser.
Watch screencast at NetTuts+ to see it in action:
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