As you know, there has been a license change of openstreetmap that rejects creative commons. http://wiki.openstreetmap.org/wiki/Open_Database_License
there are a number of forks of the osm data set under the creative commons license, one is fosm.org that is to continue under the cc-by-sa license.
Would it be possible to use the toolserver for rendering of the fosm tiles? https://wiki.toolserver.org/view/Rules mentions openstreetmap and related projects, this project is related but not the same.
please advise, thanks mike