Creative Commons Search BETA

Yahoo has launch a Creative Commons Search (BETA),

This Yahoo! Search service finds content across the Web that has a Creative Commons license. While most stuff you find on the web has a full copyright, this search helps you find content published by authors that want you to share or reuse it, under certain conditions

The search has two extra options of "Find content I can use for commercial purposes."

and "Find content I can modify, adapt, or build upon. "