You know whats awesome about Arduino? Ummm everything! You know what's not so awesome? Debugging your megalithic stack of Arduino awesomeness. When your Arduino project just isn’t working right, reach for your Dr.Duino and let it help you untangle the menagerie of ones and zeros stuck inside your Arduino! Dr.Duino™, powered by awesome, powered by YOU!
Arduino board not included, Soldering & Assembly required.
I've yet to meet a shield to use it on (mine has worked UFB), but can see a lot of ways to debug shields that doesn't work or to use it for developing a shield. BTW do yourself a favour and place the pins and sockets right the first time - it's a p.i.t.a. to get them switched around if you don't ;-)