Yahoo has been doing some really exciting things lately and the good news just keeps coming! Jeremy Zawodny points out that they have added support for Creative Commons:

Today we’ve launched a Yahoo! Search for Creative Commons at search.yahoo.com/cc which complements their existing search. The goal is to make it easier to locate Creative Commons licensed content anywhere on the Web. So you can now look specifically for works that you can modify, adapt, build upon, or even reuse for commercial purposes.

Fellow developers: there is also a Creative Commons Search API accessible through the Yahoo Web Search API.