I have always had an interest in robotics but never really gone out of my way to find myself a kit to get started. I recently thought about trying to build some sort of quad copter with A.I. but it could prove costly if the thing kept falling out of the sky or flew away.
Therefore I decided that a land robot would be preferable.
Here I have a kit I ordered from a robotics company I found in the back of a Linux magazine.
It comes with a tracked chassis and all of the electronic components required to build and program a robot that will use ultra sonic sensors to scan its surroundings.
Its exciting as I will be able to write the A.I. for the robot and improve on it to make it more intelligent.
I also have the option of adding additional circuit boards to the robot to add functions such as light and sound.
I will not be using the Raspberry Pi with it right away but I do have the option of integrating it in the future if I need to expand its functions.
Shane's Shed 
The more sensors – inputs and outputs – the more possibilities there are to sense the environment and hook up to logic. Got a wireless board connected to my Pi with themometer and light sensor, but would be keen to get sound and motion detection connected. Is the kit you’ve bought targeted at the Pi?
Hi the specific kit I brought uses a Seeeduino board which is based on the Arduino boards. You can get a board for the Pi letting you use Adruino compatible boards on the PI. Some of the other kits on the store and in their blog do this. Here is a link to the site and kit. http://www.dawnrobotics.co.uk/rover-5-seeeduino-arduino-robot-kit/ One of their blog posts shows this kit with the Pi integrated.