I'm always on the prowl for good social media resources, and here are several recent slide decks from SlideShare that are specific to social media and nonprofits.

Introduction to Developing a Social Media Strategy for Cambridge Nonprofit Organizations by Vanessa and Colin Rhinesmith. An incredibly detailed and easy to follow slide deck that is really focused on creating a strong strategy. "Must-view".

Social Media for Nonprofits by Manny Hernandez (a little edgy but easy-to-understand tips and solid links to other resources)

Introduction to Social Media for Nonprofits by Resource Media (good channel demographics in addition to basic info).

Effective Social Communications Strategies by AARP Communications College. Outstanding look at how a large organization is rolling out a strategic social media platform and involving all of its volunteers and staff.

Social Media and Social Networking for Nonprofits by TheMarketingSavantGroup Good Tips and some interesting examples.