Anyway, I'm certainly in favor of having Boost's swap utility named boost::swap. I agree - the important thing is that a call to boost::swap swaps its arguments, not the exact mechanism by which it swaps the arguments. Also, there's a clear precedent with the standard library - the algorithm are all named after what they do, not how they do it (swap, sort, remove etc).
// - swap_impl is put outside the boost namespace, to avoid infinite // recursion (stack overflow) when swapping objects of a primitive type. Does the infinite recursion only happen using primitive types - and if so do you know why? If it does, then it might be possible to move the boost_swap_impl namespace inside namespace boost using some sort of SFINAE technique to explicitly call std::swap for primitive types.