This old chestnut has been around for ages. However, it's suck a good one, I'd put it in for the sake of reference in case folk haven't seen it.
You know Ikea's standard cheap coffee occasional table, Lack? It just happens to be just the right width for a home hacked server rack! Perfect for re-purposing old rackmounted kit that might come your way that would otherwise go to waste.
Massive props to eth0.nl for a genius bit of practical hackery.