Here are some excellent recent posts that may be useful to nonprofits looking for both ideas and inspiration. All four of these blogs are also, in general, fantastic resources for social media trends and advice.
When Characters Count: Advice for Charities on Making the Most of Twitter
Burk’s Blog » Blog Archive » Can the Arts Survive the Economic Crisis?
Beth's Blog: How Nonprofits Can Use Social Media: How Your Nonprofit Can Reach Babyboomers with Social Media
HOW TO: Give Back With Social MicroFunding in 2009