The concept of using idle computer to generate income isn't a new idea. It can however lead to some great PR for bitcoin. For any developers looking for a new project, why not deliver a simple executable which will let people mine for charity:
http://www.bbc.com/news/technology-17995888A trustworthy party can manage the pool with its pre-programmed variables and perform the donations on an up-to-date website which people can track their portion of the donations to date.