There's also contra (disclaimer, I wrote it), which is very small in size and works even on IE6. The API is slightly different though, but more flexible.
Hey guys, I just finished the year plus journey of writing a book, and I'm thrilled that I'll be soon finally holding it in my own hands. I wanted to share here a bit of what it is about.
"JavaScript Application Design" is a book about quality in JavaScript software design. The agenda is split between quality in our automation processes (build, testing, release, deployment) and quality in our development processes (creating modules, testing, refactoring, using MVC, dealing with asynchronous code, etc)
If you'd like to know more, chapters 4 and 5 are freely available from the website linked below.
Link:
http://www.manning.com/bevacqua/?a_aid=go&a_bid=e6de0d9d
You can also get it from Amazon, they're already taking pre-orders.