CloudMade/Leaflet — pull request #890 by psla (2012-08-10 13:04:22+00:00)
Title: Image overlay with fixed width and height on all zoomlevels, centered around given point.

Added ImageOverlayCentered layer, which is centered around given point with fixed width in pixels on all zoomlevels

I had such use case:
display information signs (such as: restaurant, farmacy, etc.) in given points on map, with the same width and height on all zoomlevels.