cool tool for viewing OSM data superimposed on aerial imagery

It allows you, for viewing purposes, to superimpose OSM data, in any renderer format, on top of satellite imagery from Google, Bing or Yahoo.
I wish you could use it as a tile server for Mobile Atlas Creator to create custom maps for my GPS.
Would also be nice if you could control transparency levels.

You can, with the horizontal slider at the top.


If we are about good tools check out the OSM Inspector:

showing problematic mappings in Openstreetmap:

Example for BatYam: