I for one vote for "John and Juan's Data Jamboree"
Less name choosing / bike shedding people! Let's pick some datasets to mesh and start generating ideas... I'll start: 1) http://wines.doconnor.user.dev.freebaseapps.com/index Wines is a simple freebase application which looks for things typed with Wine and does basic inference. You have "Shiraz" in the name? You are probably made from Shiraz grapes -> write it back. This could easily be done with SPARQL instead - good example of a dataset being used to make itself more complete. 2) Bestbuyers: Find friends from my FOAF who are located closest to a Best Buy store which carries a product I am interested in (so I can ask them for my birthday present!) 3) Oh-no Ohloh: Mesh up bugs (baetle / other vocabs - http://code.google.com/p/baetle/) with Ohloh (http://rdfohloh.wikier.org/) or DOAP to give me an idea of how buggy a piece of software is before I use it. 4) AusGovBase - Mesh up Freebase RDF regarding organisations in Australian government with AGLS data (there's a kind of horrible serialization that predates RDFa in widespread use) which describes what data is available by individual organisations. Use case: tell me about the government entity I'm about to try to get documents from, and what they've already got online.