Top tech stocks such as Research In Motion (RIMM) and Google (GOOG) have been making strong moves lately. According to Jim Cramer, "These gravity-defiers must be killing the shorts." And Disney's (DIS) stock spiked when the company released stronger earnings than expected, partially due to the fact that the shares were heavily shorted, said Cramer.When short-sellers quickly buy in shares of stock to cover their positions, it creates what is called a short squeeze, rapidly moving the stock price up. The ratio for measuring short-squeeze opportunities is the short ratio, which is the number of days it would take the short-sellers to cover their positions based on recent average daily volume. Stockpickr has combed through the list of stocks traded on the New York Stock Exchange and compiled a portfolio of the top NYSE short-squeeze plays. To read more, visit Stockpickr.com.