Simulated Trading

Before diving in head first, a lot of novice traders like to do some simulated trading first. Here are a couple of sites that offer simulated trading.

A simulation designed to enable you to practice investment strategies, test theories, practice day trading, learn about the various markets and compete against others.
http://www.stocktrak.com/

Practice placing your orders online and receiving your confirmations in mere seconds. Learn how to use your Order Management section to view your working, filled, cancelled or rejected orders and more
http://www.e-mini.com/eminicom-simulated.html

Test trade the E-mini S&P and Nasdaq-100 Futures with an online futures trading systems, in a simulated environment.
http://www.futures-trading.us/paper_trading.htm