IDEO Office, Sanfrancisco
Inspiration is meant to be for posting pictures, articles, videos, and other things that could be related to the challenge. This step is to help the community think differently, and give ideas for concepts.
Examples:
Inspiration: I have recently planted a rooftop garden, here are some pictures. (pictures of their roof top garden)
Not Inspirations: We should have fast food restaurants grow rooftop gardens.
Yes these aren't the best examples but they illustrate my point. The Inspiration example isn't saying what to do, just showing something relating to the challenge. As for the Not Inspiration example it is giving a concept on how to tackle the challenge.
If you would like a fantastic example of inspiration check out my newest post on OpenIDEO.