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When I move the map the new parts take some time to load. Is it possible to preload some of them? Otherwise, great site.

The tiles or the "data"? Tiles are served over S3 (non-CloudFront).

Very cool, but can we get metric units? Google does a good job of facilitating this: http://img.skitch.com/20100719-t7nebfpieb75hrsbhu9w29361k.jp...

I dig the toggle; thanks for the request.

How do you guys make money? Sorry, didn't have time to explore the entire site

Looks like they have a 'pro' account, which gives you access to a lot more data (radar maps), plus email alerts.

Advertising and Pro accounts (b2c & b2b).