I could care less about IE6, as long as it works in IE8, Firefox 4, and Safari 5
This makes me happy.
Try this: Live Demo
display: table is surprisingly good. Once you don't care about IE7, you're free to use it. It doesn't really have any of the usual downsides of <table>.
CSS:
#container {
background: #ccc;
display: table
}
#left, #right {
display: table-cell
}
#left {
width: 150px;
background: #f0f;
border: 5px dotted blue;
}
#right {
background: #aaa;
border: 3px solid #000
}