The JQuery organization has announced a new JQuery Learning Center. The core of the content is based on Rebecca Murphy's JQuery Fundamentals online learning course, which is really well done.
So I am guessing this is going to be a very useful site for those of us who use JQuery. All the content is generated with Markdown and you only need Git if you wish to contribute content. The content and code is under the MIT license so you can pretty much do whatever you want with it.