I know of two locations with overhead crosswalk lights that aren't just stoplights at trails for pedestrians to cross.
https://maps.google.com/?ie=UTF8&ll=44.455084,-93.169133&spn=0.000603,0.001094&t=h&z=20&vpsrc=6&layer=c&cbll=44.455083,-93.16928&panoid=qe83uxjXO-4ZIJ88Bdawnw&cbp=12,262.59,,0,-2.7
And a much older design:
https://maps.google.com/?ie=UTF8&ll=44.293505,-92.669227&spn=0.000602,0.001094&t=h&z=20&vpsrc=6&layer=c&cbll=44.293505,-92.669227&panoid=-aI0u0msaL0SVn9OxOhhBA&cbp=12,199,,0,-10.79
I know the Malt-O-Meal ones only light up fifteen minutes or so between shifts, but I have no idea weather the one in Zumbrota shuts off anytime or not.
Has anyone seen any other variants of these, ie one where you press a button and the lights come on?
These are huge in the Puget Sound area. The ones in Seattle tend to just flash 24/7, but ones in Bellingham tend to be actuated like the ones you're looking for.
Madison, WI has installed a few recently...
https://www.google.com/maps?ll=43.073521,-89.416054&spn=0.000422,0.000817&dg=opt&t=h&z=21 (https://www.google.com/maps?ll=43.073521,-89.416054&spn=0.000422,0.000817&dg=opt&t=h&z=21) Unfortunately the streetview is too old to show them at that location.
https://www.google.com/maps?ll=43.060734,-89.447578&spn=0.000003,0.001635&cbp=12,78.53,,0,5.02&layer=c&panoid=NB82ketMGP5Dhegbf01Opw&cbll=43.060734,-89.447578&dg=opt&t=h&z=20 (https://www.google.com/maps?ll=43.060734,-89.447578&spn=0.000003,0.001635&cbp=12,78.53,,0,5.02&layer=c&panoid=NB82ketMGP5Dhegbf01Opw&cbll=43.060734,-89.447578&dg=opt&t=h&z=20)
Fayetteville, Arkansas has a few of those now along the Scull Creek Walking Trail. One crossing upgraded from a flashing yellow to a full traffic signal due to heavy auto traffic.
Boone, NC at a shopping center - http://goo.gl/maps/7Ybix
There are some of those along Northwestern Ave in West Lafayette, IN at one of the Purdue parking garages. Those are on 24/7. Nobody actually stops for pedestrians there. There's another one connecting the parking garage to the municipal ice skating rink down by the river that, if I remember correctly, activates an overhead animated pedestrian crossing sign. It's very unique. I'll have to get a picture next time I'm up there.
One that I've never noticed myself but found while messing around with new Street View imagery.
http://goo.gl/maps/k05c6
Notice the lack of a marked crosswalk.