Every once in a while a new contraption comes along that makes you go "hummm". When I stumbled upon this little gem that's exactly what I thought.
Xbox junkie? Perhaps a Gulf War vet that got used to having an Aimpoint or Eotech red-dot sight on your service rifle? Well, wait no more - you can now mount a red-dot optic on your DSLR presumably for shooting birds in flight.
Just plop this baby on your hotshoe mount and start blasting tangos... I mean birds at 8fps with your favorite shooter.
Unfortunately this little gem isn't commercially available (at this time) and it's DIY. But the sight can be had for a mere $29 on Amazon.com and the rest looks fairly easy to make yourself... assuming you're so inclined. For me? I'll stick to my viewfinder.