First, I want to say I'm extremely excited about JSF 2.0, and I think it's a major leap forward for the framework.

That being said, there's one thing that's been bugging me for a while: no built-in support for conversation scope. (For those who don't know, "conversation" scope is shorter than a servlet session and longer than a request, and is popular in frameworks like Seam, Spring Web Flow, MyFaces Orchestra, etc.).

Read the full editorial at JSFCentral.