Connecting PS/2 keyboard problems

Hi!

I tried today to connect a PS/2 keyboard to my Arduino, using the PS/2 library ( http://www.arduino.cc/playground/Main/PS2Keyboard ). However, I did not manage to get it to work. I do not know if I've connected the right wires to the right pins, but I think so.

The num-lock LED on the keyboard can be lit/unlit, so I guess the 5v and GND is correct. I've tried most pin to wire combinations.

Any other suggestions on what may be wrong? Anyone who's used this library successfully?