I see why some would call Martini "magic" but I'm not entirely sure I prefer having to deal with a giant `map[string]inteface{}`. What you are really doing is moving the "magic" from the framework and onto the developer (I now have to do type checking and casting).

That said I'm a huge fan of Martini and I actually use codegangsta's Inject in my other projects to manage shared state/resources, so I am heavily partial to it.