I started using jQuery in 2007, and I'm still using it today. Granted, a lot has happened between now and then: new JavaScript libraries, more consistency across browsers, and enhancements to JavaScript itself. The one thing that hasn't changed in 10 years is the expressiveness and conciseness of jQuery. Even with all the new hotness out there today, jQuery remains the go-to tool of choice for getting work done quickly, and efficiently.
This book has a long history behind it, and it remains intact in its fifth edition. It has been a successful book because it is straight to the point and easy to follow. I've done my best to preserve what has worked so well for this book. My goal is to modernize learning jQuery for the current web-development landscape.