I discovered Coursera a while back. You can take all kinds of classes (and tons of computer related ones), for free, and they are very good. Universities from all over the world participate in hosting these classes. Most of them take 68 weeks to complete, and you do it at your own pace and time. Here's the link: https://www.coursera.org/
Most of the sites that I see using jQuery tend to be bloated messes filled with errors, and often will not even display pages properly on any but the coders' computer. For example, I visited one site today using jQuery (a government site) and the pages won't even load because they are stuck in an endless jQuery loop.
Although there are lots of materials on learning JQuery.
I like this course by codeschool:
because they break the learning process down to stages, which is really needed in case of something as actually complex as JQ.