Short version: It's common to return large objects—such as vectors/arrays—in many programming languages. Is this style now acceptable in C++0x if the class has a move constructor, or do C++ programmers consider it weird/ugly/abomination?
Long version: In C++0x is this still considered bad form?
std::vector<std::string> v = BuildLargeVector();
void BuildLargeVector(std::vector<std::string>& result);
Dave Abrahams has a pretty comprehensive analysis of the speed of passing/returning values.
Short answer, if you need to return a value then return a value. Don't use output references because the compiler does it anyway. Of course there are caveats, so you should read that article.