I recently discovered the Travel StackExchange site and thought it would be cool to see where my fellow travelers live so I built a map using the StackExchange API. A nice side-effect of the shared API was that my app works for all StackExchange communities.
Looks good! It's times like these that make me wish it was more of a standard to use your ZipCode as your location instead of city (and convert to city in the background), so the points on maps like this would be more spread out in cities. Also, you should make the "Choose a StackExchange Site" drop down more prominent since it is a required first step.
Nice!<p>One suggestion: when a cluster of markers are clicked, pop out all of the children of the cluster - you can do this by setting the 'zIndex' of the marker.<p>Also, it would be even better to dim out all of the other markers.
I like this very much. How did you implement the effect where if there is more than a user at a given point, when you click on that point a bunch of pins open radially from that point? Is that called clustering?