O'Reilly Radar > Home Solar as User Generated ContentGreat analogy. User generated content is clearly going to be key in both the physical and digital worlds, whether that distinction even makes sense anymore.
For me the most concrete example is media. Today we watch TV channels, read newspapers and consume other media that has been edited together into different and separate consolidations (Wall Street Journal, ESPN, etc).
Many of us also now get our content from family and friends (email, photos and videos), from individuals via blogs, youtube videos and podcasts.
DVRs such as Tivo and technologies such as on demand and iTunes have allowed us to break out of the edited streams of media we get from the TV broadcasters.
Community rating sites such as Digg have allowed us to find more relevant content for us. Amazon and Netflix have engines to help us find more content that we will be interested in.
Technologies such as RSS and readers and aggregates have allowed us to edit our own content together.
We will all want access to this personalized content via familiar mechanisms. It is unlikely that each of us will continue to do this discovery and aggregation ourselves. This will become a service that is provided to us just like our cable companies and news media do today.
What will it look like and who will own it? Good question. If I knew that I would be off doing it myself.