Real short post today just a quick snippet of jQuery that solves the 100% height problem.
Yes there are complete CSS solutions to this but it seems that at times they can be problematic, and at other times laziness can kick in.
$(document).ready(function () {
$("#divID").height($(document).height());
});
//And the slightly more fancy way. With a subtle slide down.
$(document).ready(function () {
$("#divID").animate({ height: $(document).height() }, 500 );
});