Free online trading

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Zecco

"Apply today for a free stock trading account with Zecco.com and enjoy zero commision stock trading" you can make up to 10 free stock trades in any one month that you maintain a $2500 minimum account net equity. After that, you pay only $4.50 per stock trade. Options trades are $4.50 plus $.50 per contract. Only the first account of any account type is eligible for the Zecco Trading, Free Trading program. Any multiple accounts of the same type with the same registration are not eligible for the free trading program. Free Trading Program is only available through Zecco.com. $0 minimum to open cash and IRA accounts. Margin accounts require a $2,000 minimum balance for opening and trading on margin.

UpDown.com

UpDown.com is not an online trading platform where you trade real money, but it lets you setup a virtual trading account with $1,000,000 and pays cash prizes based on your trading performance. The nice thing is that it pays out prizes based on short term and long term performance, so if you're not the type to rely on luck to catch a dollar move on a dollar stock, you can still have a chance to win some cash by picking long term winners.