This one's a bit of an oldy: I wrote it years ago when I still worked for Not a Number (the company that developed Blender for a while). It's now part of the Blender Manual which is released under the Open Content License.
It teaches you everything you need to know about the Sequence Editor by editing a tiny videoclip which is composed of several layers of animation.
The tutorial is available here.
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The link doesn't work!