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.