Someone just sent a mail to the xorg and compiz mailing lists, pointing to this YouTube video regarding a new way of (ab)using the Nintendo Wii to control a virtual environment. If you didn’t see it yet, check it out, it’s rather impressive:
[youtube]Jd3-eiid-Uw[/youtube]
I don’t know whether this could actually be useful in a pure desktop environment, but for games (although I’m no gamer myself) I could imaging this offers a whole new spatial experience. Up to Nintendo or third-party vendors to design and commercialize the necessary gadgets or remotes.
Too bad there’s not enough empty space around our TV at home, otherwise I think I’d buy a Wii, love the tennis game 
How about around a monitor with a composite, S-video, or component inputs?
where’s the link to, or embed of youtube?
It should be in there, but maybe the fact I use some WP plugin to display YouTube embeds is set-up to generate XHTML compliant code, and your browser doesn’t like this. I’ll switch it off.
@Anonymous: actually I got one of those, but it’s rather small (17″ TFT monitor)
One thing about Gnash is that it can cope with videos directly on YouTube, but shows only a useless white rectangle if you try to embed them somewhere else.
Used in a pure desktop environment you say?
http://wiki.compiz-fusion.org/Plugins/Wiitrack
Enjoy.