If I have a question about Ubuntu, I now have 3 places I could take it to:

 - http://superuser.com/
 - http://unix.stackexchange.com/
 - http://ubuntu.stackexchange.com/

It seems to me that Ubuntu is a subset of Linux/Unix which is a subset of Superuser, so if I have an Ubuntu question, I can really take it wherever I want.  What **should** I be doing?  Should we be migrating questions?  Should I be asking my questions at the narrowest level possible?  Or are some types of Ubuntu related questions more appropriate on each of these sites? Like a kernel compilation question might be best on the Unix/Linux level and things like that?