I would recommend RichFaces as a JSF library. I have used them all (ADF, ICEFaces, MyFaces Tomahawk, etc.)
The current release of RichFaces (3.2.2) is very stable. There is IDE support, great integration with Seam, Facelets support.
We use it in our company for multiple web projects.
They are very progresive and have some cool new projects in the pipeline from Exadel which allow JSF and Flex intregration.
They have a demo site which shows all the components with the jsf source, java source, and developer guides links. Pretty easy to get started with.
http://www.jboss.org/jbossrichfaces/
www.exadel.com
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