facti.net

Inkscape is a great little scalable vector graphics drawing tool.  This website has some very nice practical screencasts on how to take advantage of the many inkscape features to produce some good drawings and learn the more advanced features at the same time.  You might want to work through the examples in reverse order, as the more advanced examples are the later ones and it is inverse-sorted by date:

http://www.bestechvideos.com/tag/inkscape/