With Stradr.com, you can simulate trading in the stock market for free!  Accounts start with up to 100,000 dollars, euros, or pounds.  Stradr has 100% market coverage, aftermarket trading, fractional shares, and local groups, so you can compete with friends.  Also, Stradr offers education accounts for free, so it can be used in school environents.  Check it out: Stradr.com!