One of the really nice thing about self-documenting code came from (as far as I'm aware, although they probably borrowed it from elsewhere) Java's javadoc. In .NET this was again borrowed.
At the end, the purpose of self-documenting code is so that fellow developers (most likely your colleagues working late or a maintainer a few years later) don't have to second-guess what a method is doing. And you really don't want them to be calling you at 11pm in the evening. It stuffs you up for the evening and it makes you guilty that they are still at work that late.
Perhaps it's possible to 'inject' code comments into jquery source code from their online API:
- download latest jQuery.Uncompressed
- grab a copy of the jQuery API
- for each function in jQuery js - following the rules from bleroy above, insert API
- happy jQuery intellisense in VS.NET 2008 :-)
- commit to internal source control
- repeat process for each new version of jQuery