Perhaps you are asking about extended sets of JSF 2. First, Primefaces released a finished product release, I believe in February 2010. RichFaces (JBoss / Redhat) just announce the release of JSF 2 this week (April 2010). Icefaces is expected to be released in June 2010.
I have successfully used Primefaces in a JSF 2 application - it worked great.
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