This was a tough choice, seeing as how I like the potential of several ideas. That said, here are the five that I, as of now, see as the best.
1. Hyperlocal wiki with Google map interface. I've also liked this idea since I heard of it, and think it's feasible, intuitive, and obvious. This could also possibly incorporate Sam's idea of using zip codes as an aggregate, which also would make it strikingly similar to one of the K-State ideas.
2. Nate's idea(s) concerning an aggregate of blogs and/or wikis based on content or topics. While we may whittle it down to focus on one particular area such as activist groups or political leanings, just the basic concept of this idea has a lot of potential.
3. I also like the Open Letter resource, combined with a topic aggregate to allow people to quickly identify the issue they're concerned about, the politician/leader they need to contact, and the resources to do it quickly and efficiently.
4. A news application for Facebook. This one seems so obvious, it's hard to believe it doesn't yet exist. An application that allows users to customize news feeds on their profiles that provide stories on certain topics or from certain geographies feels like a gimme.
5. Courtney's Follow the Money programs. I feel this is a good aggregate of available databases that simply makes connections that illuminates certain truths about the world we live in. Simple idea with great potential.
Several other ideas were also very good, but were left out because they were either unfeasible or would make better features or add-ons. Also, I'm still very open to other's Top Fives, and am by no means adamant on the five shown above. Tomorrow should be an interesting discussion.