Use three column divs within container div. Each floats left.
Add a div at the top and at the bottom that's empty and clears on both sides.
.column {
float: left;
width: whatever you want it to be;
margin-left: whatever you want it to be;
}
.clear{
clear: both;
height: 0px;
}
.column div{
margin-bottom: whatever you want it to be;
width: whatever you want it to be;
}
<div id='container'>
<div class='clear'> </div>
<div class='column'>
<div>blah blah blah</div><div>blah blah blah</div>... etc
</div>
<div class='column'>
<div>blah blah blah</div><div>blah blah blah</div>... etc
</div>
<div class='column'>
<div>blah blah blah</div><div>blah blah blah</div>... etc
</div>
<div class='clear'> </div>
</div>