In their 2004 textbook, Behind the Message: Information Strategies for Communicators, Kathleen Hansen and Nora Paul write, "Informal sources include observations about audiences, messages, and the environment in which the communicator operates, as well as networks of supervisors, colleagues, clients, neighbors, and friends the communicator deals with every day."

The implications of the APM Budget Game as a journalistic tool, an informal source, are interesting. On the backend, we can imagine a journalist looking at the aggregate decision data taken from players of the game and looking for trends or correlations between sets of decisions. Do 80% of players decide to roll back Bush's tax breaks? Are those same players in a middle income tax bracket? Also, what is the ordering of the decisions made in the game? Perhaps this could lead to some insights into how players view the importance of some of the issues at stake. Interesting trend or correlation? The journalist can capitalize on it and write a follow-up story.
It's well known that online journalism operations (e.g. the NY Times) have analytics departments that do data-mining on pages to understand both demographics and how users flow through news pages. But what about an interactives-analytics group that data-mines on the logged behavioral response to games and other interactive graphics? This type of mentality could also lead to different types of game designs since the goal would be both the user experience as well as the "exhaust", the data that could be collected, from that user experience. How to design such an interactive experience that also produces something interesting for the reseacher / journalist?
Clearly games as informal sources are not going to replace other forms of sources for journalists. Interviews of scholars or reliance on institutional reports produce different types of insights compared to the observation of online behavior. But this could be yet another way to probe at the audience and understand what is most relevant to them.
I think the budget game is a good example of a newsgame. However, it is waaaaaaay too complicated as a game that might be published to a general news audience, and way too limited for an experienced gamer.