I had recently posted about the jQuery 1.4.1 Intellisense support for Visual Studio. A user commented back saying that intellisense did not work for him. He encountered an error in Visual Studio that said “Error updating JScript IntelliSense”
If you are trying out the jQuery intellisense for Visual Studio and encounter the error “Error updating JScript IntelliSense: Object doesn't support this property”, then make sure that you've installed the hotfix that adds JScript Editor support for “-vsdoc.js” IntelliSense documentation files. You can read more about this hotfix here. Once you have applied this hotfix, you should be able to use intellisense for jQuery 1.4.1 as shown below. Just type $( and the check the documentation appear.
Note: Remember to install Visual Studio 2008 Service Pack 1 before applying the hotfix.