To enable jQuery intellisense for Visual Studio 2008 install SP1 first, here is the link: http://www.microsoft.com/downloads/details.aspx?FamilyId=FBEE1648-7106-44A7-9649-6D9F6D58056E&displaylang=en
Restart your system, you will be asked to do.
Install the VS2008 SP1 Hotfix KB 958502: http://code.msdn.microsoft.com/KB958502/Release/ProjectReleases.aspx?ReleaseId=1736
This hotfix adds jscript editor support for “-vsdoc.js” intellisense documentation files.
When you receive the message
“None of the products that are addressed by this software update are installed on this computer. Click Cancel to exit setup.”
make sure you installed VS2008 SP1.
You can find these files at http://docs.jquery.com/Downloading_jQuery, the -vsdoc.js can be found at the Visual Studio link.
To add a reference in Default.aspx to the script file, drag the script file from the solution explorer to the source view of the aspx file. This adds the reference to your page:
By the way, VS 2010 has built-in support for –vsdoc files.