The guy who can report a news story and write it up for publication is worth less to me than the guy who can report the story, write it and add a video clip.
So I'm not surprised by the latest survey that shows online, multimedia journalists are paid more than single-medium journalists. Similar surveys in the past have yielded similar results.
I don't expect this trend to continue, but that's because I think multimedia skills have become a requirement of journalism. Being unable to edit a sound file, create a hyperlink, resize an image, or create a slideshow is no more acceptable than being unable to type. Soon there will be no breakout of salaries by medium, because there won't be any more print-only reporters or TV-only cameramen or Web-only journalists.
I'm actually old enough to remember when pagination systems first came to the publishing world. I knew paste-up guys in the back room who were convinced that their skill set -- deep and narrow -- had value. They're all gone now. The smarter folks sensed that the world had changed. They learned the early versions of Quark and PageMaker. Look around your newsroom. Odds are some of those people are working on your copy desk even today.
The lesson is simple: either acquire multimedia skills or find another career.