If you are like me, a relatively inexperienced home barista, then there is no better series of instructional videos than those from Seattle Coffee Gear. The crew from this Seattle area retailer
knows their stuff and give clear and concise, no-nonsense demonstrations for the home espresso maker. They are particularly helpful for those who own a Rancilio Silvia or a Giotto Rocket, which seem to be the two they spend the most time on. They cover everything from making espresso to grinding, and most helpfully, cleaning and maintaining your machine. They also have excellent videos on choosing an espresso machine.
If you own a Silvia or a Rocket, you need to check these folks out.