Peter,
I do not know of anyone who has tagged a Plone instance - well, at least not anyone who has shared their experience back with us. I will ask around to see if there is anyone who can provide some upfront guidance to you. Do you have any specific questions?
Cheers,
Brent
Need help setting up Site Catalyst to use with Plone.
Anyone have any experience using Omniture with Plone CMS?