Arduino starter kit… with breadboard, some components (resistors, transistors…), cables and of course Arduino.
I bought it here : http://www.regaliedesideri.it/kit-for-arduino.html
The manual with kit is very useful in order to start. For each project the manual reports schema for breadboard cabling, C source code and some useful notes (such as why we use a flyback diode when we use a motor).
There are some depth notes and references to http://ardx.org/
Example :
http://www.oomlout.com/a/products/ardx/
http://www.oomlout.com/a/products/ardx/circ-01
