Mostly was alt coin trading, I just started doing BTC to USD and USD to BTC last night. It's a pretty easy trade. Set a buy for $30-50 lower than current price, whenever it hits there and you get filled set a sell order for higher. The only thing I hate about this is I have more USD sitting in an exchange that doesn't transfer USD to another exchange. At least that I can find out how to, and I refuse to buy BTC when its $100 more there than at the exchange its going to.. I don't want to kill money that easily.