LOGO is one language that was specifically designed for children to learn to use.
Developed in the late 1960's it's very easy to use. At my primary school in standard 2
(1994ish) they let us play around abit with it for a while. It's usually used to 
control a 
robotic turtle or cursor on screen in simple exersices but can be used for much more
than that It's kind of based on lisp the book I've got in front of me says.
It's generally used for drawing shapes etc either on the screen or floor (if you have 
the turtle)
You should be able to find more about it and some versions on the web try google.
I've seen some nice fireworks display writen using logo 
For example Here's a very very simple program and a more complex form of it.
Each draws a Square

TO SQUARE1
FORWARD 100                     //moves turtle or cursor up 100 units
RIGHT 90                                //turns the pointer/turtle right 90*
FORWARD 100
RIGHT 90
FORWARD 100
RIGHT 90
FORWARD 100
RIGHT 90
END

?SQUARE1

or More complex

TO SQUARE2
REPEAT 4 [FORWARD 100 RIGHT 100]
END

? SQUARE

Or even more so

TO SQUARE :SIZE                                         //:Size is a variable
REPEAT 4 [FORWARD :SIZE RIGHT 90]
END

? SQUARE 100

Chad

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