CSS to vertically align text to middle of div

Question

What is the correct way to force text in a div to vertically align to the middle? I have found a couple 'tricks', but I need something that works with a single line and multiple lines. Hopefully I am missing something stupid simple:

http://jsfiddle.net/rogerguess/DawFy/

.header {
    display: inline-block;    
    text-align: center;
    width: 123px;
    background: green;
    border-radius: 4px 4px 4px 4px;
    height: 80px;
    vertical-align: middle;
}

<div >
    <div class="header">test1 </div>
    <div class="header">some text that will wrap</div>
    <div class="header">test3</div>
</div>

Answer 1

Change display: inline-block; to display: table-cell;