<sarcasm>Developers their best chance to stay in the game? Ballmer knew that a long time ago... http://www.youtube.com/watch?v=KMU0tzLwhbE </sarcasm>
The best I can find is Live Search API: http://search.live.com/developer/
Which is nothing compared to what Yahoo! is offering.
Edit: Sarcasm doesn't work on the Internet ;)