I just got done with a short promo/psa that I'll be sharing with some other podcasters during the holiday season:

 http://www.501c3cast.com/mp3s/501c3castHolidayPromo.mp3

In it I encourage people to consider making honor gifts instead of purchasing gifts for loved ones.  I'd love to see nonprofits reach out like this with short 1 minute blurbs about what they are doing or how the public can get involved.  It's easy to do and can be distributed quickly.  The file is just about 1 MB which can even be emailed if needed!