 Other iPod models were released on a regular basis, increasing the device’s capacity, decreasing its size, and adding features including color screens, photo display and video playback.By early 2008, more than 119 million iPods had been sold, making it not only the most successful portable media player on the market but one of the most popular consumer electronics products of all time.Rubinstein - sometimes called the "Podfather" because of his role in developing the iPod - was also instrumental in creating a robust secondary market for accessories such as speakers, chargers, docking ports, backup batteries, and other add-ons.