Eric Floehr has a business that "holds a mirror up" to weather forecasters, and aggregates and evaluates forecasters for weather forecast consumers. Rationalists interested in improving our societies truth orientation might be mildly interested.

http://www.johndcook.com/blog/2011/04/12/weather-forecast-accuracy/

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Wow. How many things are there out there like this, where you just vaguely assume that someone's already doing it - that weather companies are all data-crazy and keep every last byte and analyse it seven ways to Sunday and sell it in every way they can - and it turns out no-one was doing any such thing until this guy thought he'd write a Python script?

There's a reason I have two weather apps on my (shiny new) BlackBerry.

But yes - there are endless startup opportunities for the next Nate Silver.