Cocoa Drag and Drop (ObjectiveC)

Hi folks, I've got a small Cocoa ObjectiveC StatusBar (or Menulet) application that needs some drag and drop love. Quite simply, I'd like to be able to drag and drop a file (from finder) onto the StatusBar icon which then submits that file via HTTP post to an API I have made available. There's the chance of future work as the app progresses - but for now, all we need is drag and drop file ability. The project uses XCode 4.1 - make sure you have this. Cheers, J