[willstepp]

display:table and its kin are the greatest thing I ever discovered in css. No more centering problems and easy to reason about. I'm not sure if people just don't know about it, or there are use-cases where it doesn't work for them. I'll definitely use Flexbox when its more widely supported, though.

[pault]

They don't wrap when their parent container shrinks, but sometimes that's the behavior you want (navigation bars for example), and media queries get around those issues nicely.