I haven't had a chance to review the material thoroughly yet, but the Woodrow Wilson International Center for Scholars is in the process of posting a series of papers and video clips on nanotechnology and the environment.
I'm especially interested in this paper (PDF, 398 KB): "Nanotechnology and Regulation: A Case Study Using the Toxic Substances Control Act." It's been argued that existing regulations, with only slight modifications, can be used to regulate nanomaterials. This paper asks the question: "How would an existing regulatory framework, the Toxic Substances Control Act (TSCA), administered by the Environmental Protection Agency, apply to nanotechnology?"
Can't wait to read it, and congratulations to the Wilson Center for taking the lead in presenting this scenario. The presentations came out of the center's "Dialogue on Nanotechnology and Federal Regulation" on Oct. 2.