Yahoo! Search is beta testing a new feature for their Advanced Search. Searching for content that is clearly labeled with a specific Creative Common License.

This is something unique that I have seen that Google has not even remotely touched on yet. Why would you want to sort by which Creative Common License is used? Simple. I would want to search by license because it would then let me know what I could use freely or what I would have to give credit to, or anything along those lines.
This is a great beta tool that Yahoo! is testing out and I hope they push it more.
Tags: beta, creative commons, search, yahoo