For this instructable you will need:
An Arduino - I used the duemillanove, but you could always make one
Jumper Wires - I ran out of wire so used paperclips for this, but you could alway make your own
A momentary push button - I assume that you could use the one built into the protoshield!
A 10 Bar LED Bar Graph - you could just use 10 LED's for this, I found mine in a broken CD player
A Piezo-Electric Buzzer - I just desoldered this from an old Kitchen Timer with a broken chip in it, which was why I wanted to make myself an Arduino one in the first place!!
A resistor - to use any button with an Arduino a resistor is used; which gives a base voltage when the switch is open, and is bypassed when the switch is closed. I used a 10k resistor which I desoldered from a seed sowing machine.
An Arduino Shield - I have used this, since I like experimenting with my Arduino so don't want to have to keep building my kitchen timer whenever I need to use it.
A shield mounted breadboard - this just makes the whole thing a little neater.
More Resistors - for your components so as not to blow pins on your Arduino. Although I know that this is a good idea, I don't own enough resistors and don't know how to use the pull-up ones within the Arduino, so I have done without them for the moment. This is something to bear in mind, it's not my fault if you write off your Arduino!