While the YouTube Video Editor is certainly nothing to compete with the likes of Final Cut Pro or Premiere, it has the basic functionality needed to finally make it possible for those living the ultra-mobile, ultra-lightweight lifestyle to put their videos online without having to leave all the unwieldy odds and ends.
The editor is simple and intuitive, with a drag-and-drop interface showing a full thumbnail inventory of all of your videos. Editing a video consists of setting a starting and stopping point for each clip, so if you want to select multiple clips from the same video, you simply drag that video to the bar below and repeat the process for each clip. In much the same way, different videos, or clips from those videos, can be spliced together.
Of course, rough editing like this can leave some interesting audio, so YouTube also provides you with audio tracks to overlay over the entire video from its AudioSwap library. Two caveats come with using the audio overlay - adding an audio track from the AudioSwap library will permanently erase the audio track on the mashed-up video and YouTube says that it may display advertisements on videos using these audio tracks.