This is a great piece of work by Alastair Bruce, content manager for MSN UK, showing how 30 online providers are charging (or not) for their content.
In short, freemium is the most popular model, full subscription the least popular. Micropayments are being used, but not much.
Prediction? Watch the increased use of micropayments as part of a freemium service. And also, watch as some providers stubbornly refuse to charge for content, seeking alternative ways to remain financially sustainable (for example, The Guardian, which is experimenting with all sorts of approaches at present, such as providing its content via an API).
(hat tip Journalism.co.uk)