Seeing as my arduino now has quite a few things plugged into it, I decided it would be best if I had some sort of pre-made cables/wires to plug into it to ensure nothing got shorted/tangled up. So I was looking into getting some jumper wires (see http://www.maplin.co.uk/Module.aspx?ModuleNo=2013) which have a diameter of 0.6mm, are those thin enough to be used with the inputs on the arduino?
They should work, but you get much better value here: http://www.earthshinedesign.co.uk/index.php?route=product/product&path=47_49&product_id=85
i measure 0.90mm on my female headers (or at least as deep as i could get the ID faces down in there) so .6 will be fine