I recently made a small contribution to http://www.cvedetails.com/.
If you are in the IT Security field and ever need to analyze CVE data or search for security issues on a certain product or Vendor, this is a great site to use. This is one of the few sites that are purely focused on security data and details that can be used to do objective security research.
I would encourage anyone else out there that finds this site useful to make a contribution. If your company could use their data or services I would encourage you to become a corporate sponsor.
We need more of these types of sites that are working to improve transparency and availability of IT Security related data.