"Tighten your edit. You may have worked hard on those several seconds of clouds, or bizarre color-cycling patterns, or whatever, but the rest of us are going to be bored watching it and may very well click away and watch someone else’s video. Make things happen all the time. Give us a title card on the screen, or come on and talk, or cut to the next thing, but do it quickly. Here’s a guideline: once the content for that part of the video is finished, start counting. If you can count higher than 1 before the next part of the video, edit it down! Exceptions might be a pause for comic or dramatic effect, but don’t pause too long."I stumbled upon this quite randomly when checking in on what Chris Pirillo is up to, but it's a good resource - if you're just getting started editing videos for sharing on YouTube, this is a good starting point for tips.