For those that are new to investing and don't necessarily have a grip on it yet click the link below.
http://wharton.pearsoncmg.com/otis/
This is a stock investment simulator I've used in class. It cost $20 but it will allow you to trade, buy, sell and just get an understanding of the market without losing REAL money while learning. Just a thought for those of you still a little worried about losing your hard earned money.