The sites News International hopes will persuade readers of the Times and Sunday Times to pay for online journalism were launched this morning. Take a close look.  They are free to view for the first month, but will retreat behind a paywall after we’ve all had a good chance to sample the wares. Will the experiment generate revenue to pay for journalism? John Witherow, editor of the Sunday Times, has predicted that his title will lose 90% of its online readership. But he hopes that losing a vast number of uncommitted readers will be more than compensated for by the 10% who truly appreciate good journalism. James Harding, Editor of  the Times, explained the argument on Today. The world of journalism is watching to see if this will work. Optimism is not widespread, but many people who do not believe paywalls can pay hope they will be proved wrong.