It seems logical that Thread objects should be constructed with delegates marked "shared," but there's no way to do this right now:

---
import core.thread;

class A {
    void doSomethingMultithreaded () shared {
        // blah blah
    }
}

void main () {
    auto a = new shared(A)();
    auto t = new Thread(&a.doSomethingMultithreaded);
    t.start();
}
---

Even in lieu of making it mandatory, an overloaded constructor making use of this would be helpful.