According to a report on the Stock Artists Alliance web site, "Orphan Works is back. Last month, the U.S. Congress held Hearings, making clear that the wheels were again in motion. Last week, it became official when new versions of the Orphan Works Act of 2008 were introduced by both the House and Senate."
If you're not familiar with the Orphan Works issue, it essentially means that if your copyright information gets stripped out of the metadata of your photo, and someone wants to use that image, they may be able to do so if it is determined to be an orphan work. SAA is looking to protect the rights of photographers by making sure this legislation isn't too loose. They have a nice piece on the issues surrounding this legislation.
This is something for all photographers to be aware of, not just stock shooters. Once your images are in the wild, you want to be sure you're given credit for the pictures you take. And if there is money at stake, you need to be part of that conversation. Learning about the Orphan Works legislation is important for all of us.