One of my ideas in this space was post-pay micropayments. Instead of asking for money up front and then allowing people to spend that in a trickle on individual articles, you would count views to stories by people (logged to user table or just using a cookie) and then guilt-induce people to donate.

"You've read 46 articles over the last month. Contribute $9.20 now (20c per article) - we'd really appreciate it."