Re: Open Street Map
"Open Street Map? Really?"
"They are not credited in the provided link"
They (we, since I also contribute) are now. http://blog.osmfoundation.org/2012/03/08/welcome-apple/
"their CC-by-SA licence is incompatible with mixing the information with propriatry mapping data from Tom Tom."
Not from the CC-by-SA side, as far as I am aware. You, Apple, and anyone else are perfectly welcome to use OSM data in any way you see fit, by itself or along with other providers, as long as credit is given.
(Not an OSM Foundation member or spokesman, just another one of the many contributors of OSM data, but it still "my" data and yes, go ahead and use it, that's the whole point.)