The Sims3 Modding Videoguide.
This guide covers the sim moding using The Sims Resource Workshop and ZModeler3. The actual package creation and game modding is beyound this guide and handled by the Workshop.
The meshing and UV mapping is not covered, while the overal process of modding is fully described.
Part 1: http://youtu.be/BGj0szxzeWM
Part 2: http://youtu.be/HMvUnc5nUbM