Interestingly enough, Blender has a built-in video editor that can handle HDV & Audio with unlimited tracks and a small collection of visual effects.
WeVideo, allows you to upload: video, audio, images to a FREE account. Once you're done, you'll be able to upload to a YouTube account.
KDEnlive has a pantheon of full features that can be compared to some of the major professional competitors. See video clip above.
With the exception of Windows Movie Maker, iMovie & JayCut, this list is mostly compiled from Free Open Source Software.