Low risk, high yield. Read on.
Market: Cubs 2006 Win Total
Stock: at least 60 games; at least 65 games
Risk: none at all
Buy equal shares of both stocks. As of 9/16/06, that would cost you about 80 Inkles. Look at the market page and look at the other stocks. Now look at the Cubs' record. You'll see that they have 59 wins and 89 losses. Since there are 162 games in a season, this means that the Cubs have 14 games left. If they lose all 14 games, then you're out of luck. But if they win just one more game, you're guarunteed decent profit. Once they win one more game, the Cubs can only have more than 60, or more than 65 wins. No more, no less. Either the Cubs lose 14 games straight (which would be ridiculous) or you make at a minimum 25% rate of return. I like.
UPDATE: The Cubs just won their 60th game. Now my little caveat about some risk is meaningless. Go ahead, by some.