Gizmodo always has some of the coolest things out there. Here's one I wouldn't mind having as part of my home theatre system (though I'm not sure I'd want to feel Jet Li's punch in my ass, I'm not into that kinda rough stuff):

Crowson TES 100 Couch Shakers

If you've ever said, "You know, I just didn't feel Jet Li's punch right in my ass," when watching a DVD -- this is an especially strange thing to say if it's not even a Jet Li movie -- then Crowson Technology's TES 100 "tactile transducers" might be worth keeping an eye, or ass, on. For $650, the TES 100 Couch Kit fits under the four feet of your couch and converts the low bass rumble of your stereo system into a physical rumpshaking effect that replicates the effects of a giant subwoofer without actually producing any (on-purpose) sound. CNet has a fairly technical and fairly positive review, although for $650 (a $350 one-transducer version is available) you'd hope Crowson would include the wire necessary to connect the thing. [Gizmodo]