http://code.google.com/p/jqueryjs/downloads/detail?name=jquery-1.2.6-vsdoc.js&can=2&q=
If you are a jQuery fanatic, an ASP.NET developer, and a Visual Studio user take a look at the link above for excellent Intellisense integration. If you are not yet a jQuery fanatic but meet the other requirements take a look at the link above as jQuery has been adopted by Microsoft and will be published with Visual Studio moving forward. Good stuff.