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 a great tutorial for creating business cards using Inkscape. This tutorial has two main sections.
The first details how to create a printer ready template from a PDF guide using clones and guides. Using clones in this fashion to create a template in inkscape is awesome; once the template is created correctly, the changes that are made to the original populate thoughout the rest of the tempate!
The second section provides a detailed process for creating a basic business card (with a nifty pinstripe background). This portion of the tutorial is a great introduction into basic fill / stroke techniques, pattern fills and text editing and kerning.
This business card tutorial describes the procedure to create a stylish darker business card with a grunge bitmap texture background. While this tutorial is quite easy to follow, the author assumes a basic understanding of the inkscape interface (check out the official inkscape intro tutorial).