Thank you Bill. This is exactly the sort of feedback I need.
With regards to your question, the only thing it is programed to do is: once it finds an obstacle it looks left and right. Measures the respective values generated by the Ir sensor and decides which way (left or right) is more clear of obstacles. Moves back during a certain time and turns either left or right, depending on the values read by the sensor.
What other sensors or actuators do you think could add more functionality or interactivity to this small platform?
....I was thinking about a buzzer so that it would make some sort of noise.....like a sonar 
depending on what he reads from the sensor....
As always, your opinion is more than welcome.
Cheers.