We currently have these 4 tutorials for UIKit and TexturePacker.
Tutorials for other frameworks are available from the tutorials list.
Tutorials about sprite sheets and game optimization:
Optimize your PNG files with TexturePacker. Reduce file size and improve performance. Learn how to adjust settings for lossless and lossy optimization.
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.
Tutorial: Create sprite sheets for your normal mapped sprites.