Last month, I talked about the new Intellisense for the JScript language. Well, the March CTP is available for you to check out this feature. Jeff from the Web Tools team, our partner in implementing this feature, has also published a very nice post that gives an aerial tour of the intellisense features. That should really get you started on this.
I said I will talk about script references in the next blog, but Jeff's blog sufficiently covers most parts of it. So, I will leave that for another day. Meanwhile, download the CTP and give us your feedback.