Cool Tech

Helmet with built-in rear view mirror.
Reevue Helmets
I don't know if these are available in the United States yet. I've sent them a note asking about US retailers.


Akuma helmet with Tint-On-Demand visor.
Akuma Tint-On-Demand
These helmets have a rechargeable power system built in. It powers the visor, communicators, rear-mounted LED's, etc.
Cool stuff.


Multivex mirrors
These mirrors are flat on the near edge and increasingly curved toward the outer edge, so you can see a whole lot more of what is going on around you.
You send them a tracing of your bikes mirrors, and they send you mirrors with an adhesive backing that sticks onto (and completely covers) your existing mirrors.
$80 from http://www.safetymirrorsonline.com/html/technology.htm/
The website sucks, but the product sounds fantastic. Drill down on the Technology and Downloads links.