You get spoiled by a lot fo the niceties of a high-level language like Python. JavaScript has *some* high-level features, but MochiKit adds a bunch more. I’ve been playing with MochiKit for a couple of weeks, and it has a very nice, solid design that does things in a way that is both JavaScripty and Pythonic.
Bob Ippolito is doing a great job with it. Take a look!