New data from Nielsen may put a temporary smile on many paid content producers' faces. It looks like American and European audiences are quite comfortable paying for content on their tablet -- in fact, 62% of U.S. tablet owners have paid for downloaded music, 58% for books, and 51% for movies.What's interesting, is that fewer were willing to admit they would pay for content -- only 46% said they would pay for music, 45% for books, and 38% for movies. This may mean consumers are trying things out...