Here is an old list of 10 of the Best Inkscape Tutorials from back in 2009. All the links should work now, again.
So, you have followed the tutorial posted a few days ago, and created a cartoon helicopter of your own in Inkscape.
However, you have decided to do some modifications to your vehicle, adding extra weaponry and gadgets. Luckily, Chris Hildenbrand did a follow-up tutorial on how to modify your vector helicopter, which is pretty easy thanks to the power of Inkscape and SVG!
Here is another tutorial from libregraphicsworld describing how it illustrate an eye in the anime style.
This is an amazingly detailed tutorial on creating a detailed snowman illustration using Inkscape. This tutorial combines inkscape basics — including path and gradient manipulation — demonstrating how simple skills can translate into an awesome drawing.
This tutorial was originally written in Russian by Yuri Apostol and translated into English by Alexandre Prokoudine. As an added bonus, Yuri has also added the source SVG (released under the Creative Commons BY-NC-SA license) to the bottom of this tutorial. Enjoy!
Here is another tutorial / in depth guide on creating cartoon characters by one of my favourite inkscape tutorialists, David Shaw. A while back, he published an awesome guide to creating a simple cartoon character in the tutorial Slime to Start.
This time he has created another in-depth guide to character creation with Inkscape, and this time the goal is to create a cute cartoon stick man with a style similar to the Order of the Stick by Rich Burlew. Once again, David goes into immense detail of his entire creative process, and the result is a great introduction to inkscape with an awesome result.
For those of you interested in cartooning in inkscape, make sure you check out the following screenshot by Inkscape artist / developer, John Bintz (of Moment of Clarity fame.) It outlines the workflow that John goes through tracing, tweaking and inking his cartoons. Note that the screenshot is done before the 0.46 paint bucket tool came out (which i am pretty sure john had a hand in developing) so cartooning in inkscape is even easier.