I started off a couple of weeks ago with my GPU. Too slow.
Now I'm using a USB ASIC miner at 335 Mh/S. Too Slow.
I've got a Red Fury on order. It'll probably be too slow, too.
It is not the speed alone that is the problem. you can buy the fastest miner available and still not make any money as long as you pay more for it than you are likely to get back out. Block Erupters and REd/Blue Furies tend to sell for more money than you will be able to make with them on places like ebay.