The Magic Connector is a lot like the BulletTrain adapter. It creates a union between the Apple Wireless Keyboard and the Magic Trackpad, making it one single unit, except without the extra bulk.
It’s great for keeping both peripherals side-by-side, especially when sitting somewhere other than a desk — like your couch. The Magic Connector also claims to be the only adapter that still allows the left and right click feature on the Magic Trackpad to work. Best part about it is that it’s only $25 and available here.