"Micropayments for bloggers". Sell articles, short stories for as little as 1c. You set the price. Readers "unlock" with 1 click.
These are some sites that use the Fraxion Payments plug-in. Check them out if you want to see the plug-in in action.
Go to the fraxion payments catalogue for an up to date list: http://www.fraxionpayments.com/catalogue