The Guardian ran two articles on sharing data in its Technology section of 20th March 2008.
One was the economic benefits of freeing up data (e.g. map data) The long-term economic benefits outweigh the income gained from licencing the data.
Another was on the public concerns for the sharing of personal data. Recent data loss fiascos have made the public wary about giving their electronic details.
The two issues are actually not in direct competition with each other, but they could easily become confused. Advocates of freeing up data need to be very wary of how their arguments are perceived within the broader public domain