Open Source .Net Development
Web Services Security
Benjaminm's blog (http://benjaminm.net/PermaLink.aspx?guid=662d151b-8c56-48c6-a23a-7372cd3a1fcb) is an excellent Indigo and WSE resource! He overviews the New WSE 2.0 Policy Advisor Tool for WSE 2.0 from Microsoft Research.