I am starting out a new project that involves the use of JSF 2.0. From my initial reading, the Mojarra and Apache Implementation of the project covers the basic components that
The speed of development is very fast in this area, and any article gets outdated quickly. I used Primefaces for a new project almost a year ago, because at that time it was the only one that was fully compatible with JSF 2 (both Icefacves and Richfaces have had JSF 2 compatible releases in the meantime).
Primefaces has a lot of powerful components that automatically use AJAX, and even more were added in version 3. Unfortunately this focus on new features led to a lot of bugs, but the developers said they would focus on bugfixing after release 3; I can't say anything about the current status since I left the project after 3 months.