kind of cool, in a "oh look shiny" kind of way. but a nice effect. I'm using the MWF2 one
[yt=425,350]<object width="480" height="385"><param name="movie" value="
http://www.youtube.com/v/eTjndKuIq5E&hl=en_US&fs=1&"></param><param name="allowFullScreen" value="true"></param><param name="allowscriptaccess" value="always"></param><embed src="
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it does eat up some resources, but you can pause/play by right clicking on the desktop. like i said, cool but maybe not practical
software:http://www.dreamscene.org/
how to:
http://www.mydigitallife.info/2009/01/14/how-to-install-and-enable-dreamscene-in-windows-7/