WARNING: If your browser is "lucky" enough to support the video tag (like certain beta Firefox 3 releases, or Safari) then there should be an image below. It might also slow the loading of the page a bit. Be patient. If you aren't lucky, it should load really fast.
Finally, finally, HTML 5 is working toward implementing a VIDEO tag (similar to the all pervasive IMG tag) which just works, out of the box. Safari and certain beta versions of Firefox already implement this tag. If I read various news reports properly, the iPhone's browswer will implement it too.
Wouldn't it be swell if we could just skip all the plug in nonsense and display video on our webpages as easily as images?