There is also Marker Clusterer for this: http://google-maps-utility-library-v3.googlecode.com/svn/tru...

I very much like this fresh solution though, particularly fond of the animation.

Thank you! To be honest the idea isn't ours: Apple does it already in their Photo apps. But for some reason they never opened this up in the SDK, so we decided to write and publish our own solution.

I'd be curious to see how Apple's code would handle 100'000 photos though :-)