The ProtoPad BoosterPack is the creation of Robg from the 43oh Forums. This is a simple breadboard in PCB form which sits over the Launchpad. The ProtoPad comes very handy if you need a base for quick prototyping in the Launchpad form factor. This allows you to create custom BoosterPacks which are sturdy and ready for the field.
For the SMD version of the Protopad, look here.