Here are two techniques to disable the blank screen on the Raspberry Pi. By default the screen is blanked after around 10/15 minutes if no user input (mouse or keyboard) is detected.
If you need to update the date and time of your Raspberry Pi running on Raspbian, you can do it automatically with the following command (in a terminal):
On the Raspberry Pi there is a very nice feature that allows to create very cool shaped windows: the control of the opacity of the 3D window.
This article describes what is
GLSL Hacker GeeXLab and how it works.
Update (2015.12.02): This article is also valid if you replace GLSL Hacker by GeeXLab!