Pencil | open source animation and drawing software

Update:
@ibeardslee has pointed me to a forked, updated version of this software called Pencil2D, which appears to be a better option than the link I give below.
(Link)
"Pencil is an animation/drawing software for Mac OS X, Windows, and Linux. It lets you create traditional hand-drawn animation (cartoon) using both bitmap and vector graphics. Pencil is free and open source.

Pencil is not intended to mimick web-oriented vector-based animation software such as Flash. Its main purpose is to make traditional animation. Neither does it try to rival commercial software targetting the professional animation sector. Pencil is intended to be a simple programme enabling anyone to make 2D animation."
(Link)

EDvent Calendar: Day 22 (Visualisations)

Three of my favourite 'sights':

1. Incidental comics is a cartoon blog that has really clever, heart-warming comics like this one:

2. http://visual.ly/ is a very good infographics site, helping to communicate easily a lot of information about topics:

3. Information is beautiful. The designers work very hard to make easily accessible very complex topics and huge amounts of data. Take a look at this one to see just how screwed the U.S. (and global) economy is.