Read original post at Corrado Cavalli's Blog
I can hardly imagine any serious web development without JQuery so I did a quick test to check if it can be used inside a WinJS project and answer is: yes! even if not in its total completeness.
You can’t use any CDN to get JQuery library, it must be included in your project (quite obvious since application must load even without any network connection) so I’ve grabbed latest version and added it to my WinJS project.