Why not add Codecademy and Wikipedia to the whitelist?
Has anyone published a whitelist of educational web sites? Wouldn't be a bad idea. Could make it a collaborative effort, too, by versioning it with GitHub and accepting online pull requests with public discussion.
Good point - should have thought about coding when posting to HN. It does look like someone is leading the effort already. The key would be to keep the overhead low and encourage the participants to mentor each other somehow.
