Measuring a Current with an Arduino

Hi! Was wondering if anyone has had experience measuring a current as an input for the arduino. I really don't know the circuity at all that would be required. The situation is hacking a power-strip type thing to see the current being used realtime.

Hi Martini, there was a recent discussion on this topic here: http://www.avrfreaks.net/index.php?name=PNphpBB2&file=viewtopic&p=483452

isn't google wonderful ;)