Clearly the term "free" can have multiple meanings. It can mean free completely or free because someone else has sponsored our app (e.g., Weather Channel Max for iPad sponsored by Toyota) or free because you're already our customer and we'll check your identity when you arrive, or free because we're going to sell you something before this app becomes useful. Some of the free offerings link to web membership and through that both a free and a premium pay service, e.g., Pandora Radio. Some content might have started off free, such as public domain books or government publications like the CIA's World Factbook, now priced at $1.99 in an iPad version from a private citizen. There are quite a few apps that link to Wikipedia content, some for free and some not. Some of the news readers appear to link to free content from established news sources such as the Washington Post (e.g., White Noise Pro). By the way, there is also a whole category of Social Networking apps.