Aww is a web whiteboard online that allows you to draw sketches without downloading any software. It kind of works like "paint". It has all the tools to draw, the thickness of the pencil, the colours...and once you are finished with your sketches, you can share them with your friends on Facebook or Twitter. Registration not required.
ClockBlock is an application to organize your appointments and to make a list of things to do indicating your priority task. You can divide the tasks by colours in order to recognize the urgent ones or use different font sizes to indicate task importance. Registration required.