I have been looking at other 'open' projects today. There is a good list of citizen science projects at www.scistarter.com
Unfortunately, it's surprising how many 'open' projects don't release their data as open data.
I did find a great project called openBmap, which is currently looking for support to keep its open project going (yes, really 'open' under odbl).
www.openbmap.org collects info on phone signal coverage - allowing you to see the best operators etc in your area. They also collect wifi data.
Best of all, they use OpenStreetMap as a baselayer on maps!
Hope someone can support this truly open project. Perhaps as a sister project?