P&P Improving Web Services Security eBook
Rob Boucher just informed me that the Patterns & Practices group has just released "Improving Web Services Security: Scenarios and Implementation Guidance for WCF", a free eBook available here:
http://www.codeplex.com/WCFSecurityGuide
If you read it, make sure to send some comments to the team. Here's how:
http://www.codeplex.com/WCFSecurityGuide/Wiki/View.aspx?title=WCFSecurityCustomerQuestionaire&referringTitle=Home