Last Updated on Dec. 15th 2011
http://wiki.creativecommons.org/CC0_use_for_data lists many organizations that use CC0 for data sharing.
And here is a list of some organizations that use other CC licenses (Attribution, Attribution-Share Alike, Attribution-Non Commercial-Share Alike): http://wiki.creativecommons.org/Data_and_CC_licenses
An interesting post, “The legal and ethical reasoning behind using CC0 for Safecast data”: http://blog.safecast.org/2011/09/the-legal-versus-ethical-reasoning-behind-using-cc0-for-safecast-data/. It differentiates quite nicely between legal & ethical aspects of sharing/using data under CC0 license.
The CC0 FAQ: http://wiki.creativecommons.org/CC0_FAQ
Here’s the text for the CC0: http://creativecommons.org/publicdomain/zero/1.0/
I feel raviiyer.org should use CC0 as the default “license” for its data. Re-users and re-distributors need not give attribution to raviiyer.org & its contributors.