As a sort of April fool’s joke (I guess) and a pun on the Open<XY>Map naming scheme somebody (Grant Slater of Firefishy?) set up an OpenWhateverMap: http://openwhatevermap.org
It doesn’t quite deliver on the promise though, IMO, since it shows ‘only’ differently rendered OpenStreetMap tiles. It fails to acknowledge the full picture of developments in the realm of open geodata with projects like OpenAdresses, (now offline but maybe to be re-launched) OpenAerialMap and (very recently launched) OpenDEM ;)
(via Mapperz)