I was pleased to come across an especially helpful article in today's Wall Street Journal, "Hidden Tools Find What You Want on Youtube."
[...] Sharing videos with friends is one of the most popular uses for YouTube, but sometimes you want to share just the best part of a video. With two clicks, you can trim videos to begin exactly where you want and then share them. As a video is playing, right click at the point where you'd like your video clip to start and select "Copy video URL at current time" to get a URL for the trimmed video. When others open the link, it will start right at the spot in the video where you right-clicked. No longer will a video clip take too long to reach the best part . . .
Edit Better
If you've ever recorded a video shot in portrait mode that you'd rather share in landscape or vice versa, the video can be switched to the correct viewing angle, saving viewers from tilting their heads to one side to watch. Do this with YouTube's editor in the cloud, youtube.com/editor. Here, people can edit (including rotate) existing videos or upload new videos. Content can be mixed in with other video clips from the Creative Commons site, soundtracks can be added by choosing from a selection of music, and text slides can be dragged in to display between video clips.
If you'd rather use a third-party company for editing, multiple options are listed at youtube.com/create. A company called Vlix recently announced its integration with the YouTube site, bringing its editing features from the Vlix iPhone app—like artsy designs and text slides—to the site. Magisto automatically skims videos for the best footage and creates short clips with that content, and the Xtranormal Movie Maker lets people add text, such as a personal narration, to an animated video. (Never underestimate the entertainment value of hearing your words come out of an animated bear with a robotic voice.) . . .
Videos From Afar
To see all of YouTube in a much more handsome layout, try Leanback, found at YouTube.com/leanback. This opens a page that's meant to be viewed far from your computer, complete with a black background and white text written in large font.
Sign In, Sign In Again
Recently, it became possible to log into YouTube using your Google account username and password (Google has owned YouTube since 2006). Using their Google account, users may browse YouTube, rent a movie and "like" a video. To upload their own videos, subscribe to a channel, make comments on and "favorite" videos and get recommendations from YouTube on content they may like, people must create a YouTube account and use that in addition to a Google account.
Testing, Testing
A site called TestTube, found at youtube.com/testtube, holds many in-the-works projects from YouTube engineers. Here, users can kick the tires of some features that aren't fully baked. One example is YouTube/slam, which pits one video against another and lets viewers vote on the best one.
Posting Video
It's important to know the sharing settings in YouTube. There are three: public (anyone can search for and view); unlisted (anyone with the link can view); and private (only people who you choose can view). Any video can always be taken down from the site by its original publisher.