Before you bet real money, it's often a good idea to test your trading, investing, or speculating approach. Here are five great (free!) sites to help high-level investors learn through simulated trading:
Wall Street Survivor: This site provides great courses on investing for beginners and experienced investors.
Stock-Trak: This is a very active site for simulated trading.
Investopedia Stock Simulator: This is a great simulated stock investing program from a premier financial education site.
Virtual Stock Exchange: This is a very active simulated trading site and discussion forum with the trader community.