I've spent the past year and change working on a site that publishes government information online. In doing that, I've learned a lot. But I've also become increasingly skeptical of the transparency project in general.
The way a typical US transparency project works is pretty simple. You find a government database, work hard to get or parse a copy, and then put it online with some nice visualizations.
The problem is that reality doesn't live in the databases. Instead, the databases that are made available, even if grudgingly, form a kind of official cover story, a veil of lies over the real workings of government.
So government transparency sites end up having three possible effects. The vast majority of them simply promote these official cover stories, misleading the public about what's really going on. The unusually cutting ones simply make plain the mindnumbing universality of waste and corruption, and thus promote apathy. And on very rare occasions you have a "success": an extreme case is located through your work, brought to justice, and then everyone goes home thinking the problem has been solved, as the real corruption continues on as before.
In short, the generous impulses behind transparency sites end up doing more harm than good.