The webshop is impressive, but lacks a basic item: a simple GPIO-controlled solid-state relay. It is the simplest (apart from blinking leds) and only necessary

The webshop is impressive, but lacks a basic item: a simple GPIO-controlled solid-state relay. It is the simplest (apart from blinking leds) and only necessary building block to get the Pi to actually do something in the real world (such as opening/closing a garage door).