In light of recent mid-air collisions involving gliders, MIT in collaboration with the FAA and the MITRE Corporation has started a project evaluating how ADS-B could be of benefit to the Soaring Community. The survey can be found here:
http://agena.mit.edu/ADSBsurvey
The soaring community is of special interest. Since they are non-electric aircraft (i.e. most of them do not have an electrical system), they are exempt from the FAA's transponder rule. As a result, they cannot be detected by ATC's secondary radar system (SSR).
The project mentioned above focuses on creating a low-cost, battery operated ADS-B system that could be installed in gliders; this would result in greatly increased situation awareness on the pilots as well as the Air Traffic Controllers part.
Preliminary flight tests are planned for this summer (2010). The survey was created to ensure that these flight tests actually evaluate issues of interest to the soaring community.