I remember somebody mentioning 'no bake fudge' a while back, so I did a quick Google on it. This page was the first result.
http://www.cooks.com/rec/search/0,1-0,no_bake_fudge,FF.html
Here's a good one.
http://www.cooks.com/rec/doc/0,187,153163-226196,00.html