Minecraft wiki entry for Tutorials, associated text: Tutorials/Mechanisms: Lists an assortment of complete devices using redstone.
Tutorials/Minecarts: Large railway systems can benefit from redstone at the terminals.
Tutorials/Hopper: Hoppers are key for item handling and sorting.
Tutorials/Storage minecarts: Loading and unloading chest- and hopper-minecarts.
Tutorials/Redstone music: Creating music with Note Blocks and redstone circuits.
Tutorials/Rube Goldberg machine: Complexity and spectacle!