Command line alarm: http://www.s-anand.net/blog/command-line-alarm/

Make background color transparent for an image: http://www.s-anand.net/blog/make-backgrounds-transparent/

Install Audio Books to your iPhone: http://techtips.salon.com/use-audio-book-iphone-10151.html

Written by Shengdong Zhao

Shen is an Associate Professor in the Computer Science Department, National University of Singapore (NUS). He is the founding director of the NUS-HCI Lab, specializing in research and innovation in the area of human computer interaction.