Just came across Infinitest during my nightly blog reading… haven’t gotten a chance to look at it, but at first glance it looks like what I’ve come to love in the autospec feature of ZenTest (and the feature that made me the most interested in jspec).
The idea of junit tests auto-running on change versus having to hit ctrl+F11 each time makes me happy. Or just lazy. 
I like to use JSpec –bind + my growl gem
for the server at least http://github.com/visionmedia/growl/tree/master