I've started using them to judge where I should sell off a little. Someone's selling off 100? It might bounce back a little. Maybe sell off a bit. 200? Ehh...it's probably gonna bounce back from that, but it might return. 500? There's almost no way it won't reverse, and it might take quite a while to bounce back to that level. Of course, every time it bounces back, I can buy a bit more at whatever level it drops to. :)

Of course, change the numbers based on what you're looking at.
That's based on me trading LTC today. :)