Aug 15th 2012
Via suggestion thread on reddit
Chad takes you around a tutorial world based on Tavirider's World of Redstone, with updates to include pistons and such. Feel free to check it out for more gate designs.
Minecraft wiki page for Redstone Circuits
CHAD'S FAVORITE THINGS!!!1!
MineZ Rei's Minimap Magic Launcher
You can now find this show on YouTube at youtube.com/OMGcraftShow.
SD Video Small
(Right-click and Save As... to download)