I've recently had a couple of articles in InfoWorld. The first was an analysis piece a few weeks ago regarding IBM's acquisition of Datapower.
The second is a review of Systinet Registry 6.0. I found Registry to be a full-featured and mature registry offering. The review is in the same issue that contains Eric Knorr and Oliiver Rist's 10 Steps to SOA. Registries are step five. I agree with the assessment that registries of some kind are essential to production-level SOA deployments, even if I'm not sold on UDDI.