OLED displays have many benefits over regular LCDs. They have better better contrast. Because there are not back-light used, a deep black levels can be displayed. They have wider viewing angles and are more power efficient. Also are more lightweight what makes them attractive for using in hand-held devices. OLED displays are available in hobby market so everyone can use them for great projects and see the benefits. Df99 have shared his instructable where he builds pretty cool alarm clock with temperature display by using Arduino Micro and 128×64 OLED display based on SSD1306 controller.
Clock function is implemented with DS3231 RTC IC which has Arduino library support. Clock has two push-buttons for clock setting. Temperature readings are done from RTC chip where sensor is used to compensate temperature drift.