I'm currently investing a lot of work in both WCF and Enterprise Library 3. It will probably turn out as a couple of blogposts.
This post however is just a placeholder for my Validation Application Block integration sample with WCF.
It uses VAB and the custom WCF binding to validate incoming datacontracts based on configuration.
It's attached to this post and the feed readers need to get to the site to fetch it (anyone got any good links on how to add attachments to RSS?)