Inkscape tutorial: bezier pen tool sketch a cat to vector
http://www.youtube.com/watch?v=lROcNQaiG2c
http://www.youtube.com/watch?v=lROcNQaiG2c
http://www.youtube.com/watch?v=4aeMP9ZyxHk
http://www.youtube.com/watch?v=UaFFTfnIC9E
http://www.youtube.com/watch?v=BeaNTkODH88