This is a big feature request, so I'm not suggesting an
immediate implementation or conversion. For the future of SE
however, I believe it solves some existing issues which might
only grow bigger as the network keeps expanding. I wrote this
originally as an answer to When will Stack Overflow become
irrelevant?, but since it's more a request than an answer, I
decided to post it as such.  The bottomline:  Questions should
be able to show up on multiple SE sites, instead of just one.
Relating to the problems:    • "Which questions go on which SE
site?"   • "Would a certain new community steal users from
another?"   • "All these SE sites are becoming a mess, there
should only be one."  The solution I believe, is to focus on
users, and not the categorization. If enough C# developers feel
it is useful to have a Q&A site for all C# questions, there is a
reason for its existence and it could become a thriving/working
community. If it has overlapping questions with other sites,
that's what those questions literally s