As my organization begins to evaluate smart cards, how can we enable smart card authentication into ecp for GUI based management?

I don't know that it would be any different than you'll be deploying for OWA.

Hi,

Please refer to the following article to configure the Certificate Based Authentication for OWA:

http://blogs.technet.com/b/exchange/archive/2008/11/12/3406481.aspx

Additionally, hope the following articles help:

How to Configure Outlook Web Access to Use a Smart Card

Using AD FS claims-based authentication with Outlook Web App and EAC

Regards,