Cleaner Content may save Google a whole load of trouble. In today's impressive earnings announcement, Eric Schmidt named the copyright filter for YouTube and Google Video.
Cleaner Content is designed so to automatically detect and cope with uploaded content which annoys pesky laws such as the DMCA. It also seems likely that Cleaner Content will allow publishers to remove content they find on YouTube which breaches their copyright.
The Q1 announcement got into the finer details of Google's robust finances (up, up and up - especially from Google.com searches) and didn't really linger too much on new technologies like Cleaner Content. Schmidt did talk about offline advertising and the radio deal with Clear Channel. I imagine we'll hear more news for the search geeks a little later on.
(Update: This may be Claim Your Content instead of 'cleaner content')