If the idea of running your own blog still seems like too much, maybe you don’t need a blog at all to get most of the benefits.
Most bloggers are hobbyists, and if they received an e-mail out the blue from a relevant major charity, they’d love to help out. Bloggers are always struggling for new content, so for the price of writing and e-mailing off a blog post, you might be able to get a guest feature on an existing blog that’s popular with your target audience. Complete with a link back to your ‘make a donation’ page, of course.
The most dramatic example of this working for a charity is Blog Action Day, a yearly event where thousands of blogs write a post about the same, global issue. Last year it was water. 5,600 bloggers from 340 countries posted about the importance of water to their 40 million readers. They directed readers to support charity:water.