This script will automatically upload your app to iTunes Connect after a successful Xcode archive action.
After doing this about a million times by hand (i.e., opening the Organizer, clicking on "Upload to App Store", waiting for teams to load, etc.), I decided I'd had enough. Now, I just go to "Product" > "Archive", sip my margherita, and kick up my feet while the world marvels at my genius, while my app gets distributed to my testers without lifting but a finger. Or...I just take a bathroom break. Either way, it's pretty awesome.
Yes, yes, I know you can do this completely via fastlane, but I'm somewhat sadistic and prefer to do my archiving completely within Xcode.