the clearfix I'm currently using

my clearfix

.clearfix {
	*zoom: 1;
}

.clearfix:after {
	content: '';
	display: block;
	clear : both;
	height: 0;
}

@media print {
	.clearfix:after {
		height: 1px;
		margin-bottom: -1px;
		visibility: hidden;
	}
}