Want a quick introduction to DCI? First, it stands for Data, Context and Interaction. Those are the three fundamental elements of the DCI paradigm.
You can get a good start at the Wikipedia DCI site:
Otherwise, please browse the site. There are documents, examples, and many more goodies to look at.
If you want to get involved, to to Google Groups and sign up for the object-composition mailing list. That's where the DCI people hang out to ask questions and discuss progress.