YouTube revealed this week that their viewership on mobile devices grew quite a bit in 2010. Like, a whole lot. As in, tripled.

Yep, they said that their mobile viewership hit 200 million viewers this past year. The site credited much of that to the announcement that Vevo’s huge music collection was added to its app for Android phones.

And of course with all those viewers, YouTube will now try harder to monetize all this. They are running more pre-roll ads now on the mobile site.

“This not only expands distribution opportunities for partners like Vevo, but also opens up more revenue to partners distributing their content to mobile. Although we’ve tested ads on mobile over the years, this is our largest step in mobile monetization to date,” stated a YouTube blog post by Andrey Doronichev, the YouTube’s mobile product manager.

That’s great for advertisers, but annoying for people who just want to watch the clip of the Giants fan cat watching DeSean Jackson’s amazing punt return.