We currently have these 3 tutorials for UIKit and TexturePacker.Tutorials for other frameworks are available from the tutorials list.
UIKit Animations with TexturePacker
Use TexturePacker to create animations for UIKit to save memory and decrease loading time
These are more general tutorials with information about sprites, sprite sheets, performance and rendering quality:
How to create a sprite sheet
This tutorial explains the most used sprite sheet types and how you can easily create a sprite sheet from a single of images. Links to free software included.
Packing normal maps into sprite sheets
Tutorial: Create sprite sheets for your normal mapped sprites.