and are the data publicly available?<p>I've built a new web mapping API and I'm looking for data that I can use to make interesting examples with. Disclaimer: I want to use these examples to attract people's attention to the API and hopefully convert them into paying customers.<p>I can only make choropleth maps (shaded polygons, election maps, etc) that overlay on Google Maps (or others soon). However, I can render in realtime hundreds of thousands of polygons client side with bring the browser to a crawl.<p>So any map ideas that are interactive or leverage streaming data would be cool. Or perhaps no one likes maps?