I am specifically looking for resources aimed at beginners in both drawing and Inkscape, if that is possible. :)
I would appreciate if the author of the answer has actually read the tutorial/book he/she recommends, and that is is specifically on technical illustration and not just Inkscape tutorials.
Okay, let me explain this a little better. I am studying to computer engineer and I frequently have to illustrate a lot of the things I work on, which usually involves some kind of network in some setting. Usually I do this in Dia by putting together more or less fitting figures that are default in Dia, or just raster images I find on google, and basically the result is something that often looks like crap.
So I started drawing many of my diagrams with PSTricks directly in my LaTeX documents, and the results here are really nice. But, once in a while I have to draw some testbed setup or hypothetical scenario involving e.g. a number of cars on a highway that are communicating wirelessly.
This is just an example, and the most fitting term for this I can look up is technical illustration, as opposed to technical drawing which is drawing of schematics with precise measurements for construction of real-world objects. So what I am looking for is a book (or tutorials) with an introduction to Inkscape aimed in the direction of drawing technical illustrations. If that is even possible.