According to the Guardian, the Sunday Times (owned by Rupert Murdoch's News International) may be about to begin charging for online content.
"Plans have not been finalised, but executives at Sunday Times publisher News International are considering the charges to fall in line with the publicly stated desire of Rupert Murdoch, the chairman and chief executive of parent company News Corporation, for his newspapers around the world to follow the lead of the Wall Street Journal by charging for content." (taken from here.)
It seems to be working forThe Wall Street Journal, albeit in a wholly different market. It will be interesting to see how this pans out, especially as at the moment The Sunday Times shares a website with its daily sister newspaper.