I think that most penny stocks are scams. When trading penny stocks, it's important to realize that most are worthless. It doesn't mean you cannot make money.
You have to go into them realizing they are not investments and you have to sell when you realize the profit you want, because if you don't, you will be left with nothing.
I normally visit this
Penny Stocks Site: http://www.surefirepennystocks.com to research. It's a decent resource.
I know that in penny stocks, they move with good news, chatter online, and when price and volume breakout occurs, you hop in. When the momoentum slows down - GET OUT! Take your profits and limit your losses, that's the way to make money with them