Just for everyone's information: This is an extract of the response I received from the Yahoo copyright people claiming that search results are now Bing's responsibility.
The email came back from email@example.com which is the contact email listed at [copyright.gov...]
As you may be aware, these search results are provided to Yahoo! by Microsoft Corporation's Bing search service. Please contact them directly as explained below for any notices of claimed copyright infringement related to algorithmic or Sponsored Search results.
Microsoft's Designated Agent for copyright can be reached:
* via email at firstname.lastname@example.org * via phone at (425) 703-5529
Please see Microsoft's Notice and Procedure for Making Claims of Copyright Infringement at [microsoft.com...] for more information.