Here is an old list of 10 of the Best Inkscape Tutorials from back in 2009. All the links should work now, again.
here is another great tutorial from kalaalog, in this one the entire workflow to illustrate a chinese style dragon, from concept sketches to finish product is outlined. This tutorial is in two parts, the link after the break links to part 1, and there is a link at the end of that to part 2 of this tutorial.
Here is a neat workflow showing how to create a fairly detailed compass graphic by adding and editing simple shapes. This is a great tutorial for inkscape beginners, as it is well communicated, and intoduces simple inkscape operations like node editing. As always the link to the tut is after the break.
Here is yet another awesome tutorial from Nicu a great tutorial for creating RPG map symbols using inkscape. In this “How it was made”, Nicu outlines a workflow for creating a simple jailhouse RPG element. Nicu is a major contributor to the Open Clip Art Library, and he has placed a large collection (50+ drawings) of these RPG map symbols into the public domain. You can also download the whole package from his own clipart gallery. Comments and praise should be left at Nicu’s Blog post for this tutorial.