I've been playing with the idea of creating a wiki-like corporation tracker. The idea is to create a public database containing information on national corporations and their relationships to one another. I'm still working out the details of what data will be stored, though, and I'd like some input.
The case where one corporation is a subsidiary of another is the most relevant to the project, but there are many other ways in which companies can be related. For example, MSNBC is a cooperative venture of MSN and NBC. I'll want to cover which brands are owned by whom, and at what level a corporation is incorporated: local, state, national, or international.
The app would update the database any time a merger occurred or a user discovered another corporation not already in the database. I also want to have a history feature, so that updates can be tracked over time and data isn't lost.
I plan to do my development over at Ning, which seems well-suited to this type of project. If anyone has experience developing apps in the Ning framework (or any other framework), I'd appreciate any advice I can get.