I have to agree with senior member Nachtwind. The RBBB, & IDUINO are small, but they still have to be mounted on a bread board, solderless or not, to be able to connect to those arduino circuits, or for adding necessary circuitry.
so the whole business takes up more room than you expect, plus the added price of the boards, etc. A solderless breadboard costs more than an Atmel168.
Those solderless breadboards are also quite thick, and I'm not sure if they retain poitive connections for a long period of time, especially in a situation where the circuitry would be subjected to a lot of vibration.