The Los Angeles Times has a great way to interact with readers who try their recipes. They solicit photos and reader feedback on the recipes through their website. The message on the recipe page reads:
Our recipes, your kitchen: If you try this or any other recipe from the L.A. Times Test Kitchen, we would like to know about it so we can showcase it on our food blog and occasionally in print. Upload pictures of the finished dish here.
Seems to me that there are other possibilities to get readers to contribute content. What about fan feedback (of course, this must be moderated) for movies that have been reviewed in the newspaper or online? Music?