Google's map API folks decided to get rid of the slider-style zoom control.
I thought about re-implementing it, and actually made a pretty good prototype,
but then I had a different idea.
How about in addition to the standard +/- buttons,
an extra pair of +5/-5 buttons that zoom five steps at a time?
This turned out to be very simple to implement.
It's called
acme.maps3.zoom5.
