Some of the most expensive data that we collect is qualitative and/or observational data. Making these data available to other researchers so that they can ask other types of questions or re-analyze data seems like an especially good idea.
There is one good example of this at the U of Illinois that begins to open up these data. This project is called the "Ethnography of the University." Faculty and students have agreed to share their data, publications, etc. in a common space. This allows more students to have access to the data, extend the questions, develop new ideas and exchange information.
Students who are interested in various topics about student life among university students have the opportunity to view multiple perspectives on this topic. Students interested in learning more about how scientists create ethnographies can see science in action.