The Orphan Works blog keeps an eye on attempts to change legislation to permit use.

The IPkat blog covers copyright, patent, trade mark and privacy/confidentiality issues from a mainly UK and European perspective. Run by a cat, plus some solicitors.

William Patry is a US copyright legal counsel and his blog is consistently insightful if only occasionally directly relevant to photographers

Spot-the-plagiarism-and-uncanny-resemblances blog. Anyone can post. Photos only figure occasionally among the videos, websites, products etc.