"For many sites, it's still about finding the right mix of free and paid offerings. Microsoft's MSN gives away some listings from its Encarta encyclopedia, but charges for other Encarta content, especially video. It gives away NBC video clips but charges for Major League Baseball highlights, as part of an MSN package sold to broadband customers. "We're all still very much grounded in both camps," says Karen Redetzki, a product manager for MSN, though she adds that increased advertiser interest has allowed the site to invest more in improvements."
You'll also find a couple quotes from yours truly in this well-documented article (not just because I'm quoted!).