When I developed my YuJisho online dictionary web application, I was looking for freely available fonts and dictionary data related to CJK languages.
For my dbscript database schema management application, I tried to find as many database schema samples as possible to test the application against.
There is a lot of data (raw, processed and visualized) available on the Internet, but occasionally it is hard to find. This raised the idea of providing a collection of references to free data sets on the web like the Guardian Data Store, and I was thinking about a platform to provide such links.
Now news is out that data.gov plan to release their platform as open source software (GitHub), but the code is still labeled as alpha. (data.gov HTML says it is based on Socrata, which also provides lots of links to open data).
Let me know what’s your experience with OpenData, or similar platforms.