Earlier quoted context omitted.
So, what are the publicly available data sets? I see there is wikipedia in one of your screenshots, but short of that I couldn't find a list. I think if I saw something enticing I would sign up just to play with it.
You can find the list of public data sets and descriptions of them here: https://developers.google.com/bigquery/docs/sample-tables
It's a bit thin, so I suggest you guys pump a lot of public datasets into it, and then do a series of blog posts about "look what you can discover from these public datasets with out awesome Q engine in a matter of seconds".