Om Malik on Broadband: After years of being stuck in the slow lane, the US consumers are finally going to get a massive speed upgrade and taste the true broadband for the first time. From a 512 Kbps world to 6 Mbps, then 8 and soon 15 Mbps…. it seems the future has finally arrived. And with that, the question…. how much speed is enough? Can we the consumers really tell the difference between 15 and 30 Mbps? Or is it just a way for the broadband operators to get us to pay more… for something which we might use less.