I'm not sure whether I should be impressed or disturbed. Okay, I choose impressed. These things are pretty cool. Check them out at BrickArms.
From the site:
BrickArms offers building-toy compatible custom weapons, weapons packs, and custom minifigs.
All are designed and produced to meet the highest standards of quality. All toys mesh perfectly with your LEGO universe, and I have sold thousands to satisfied customers around the world.
The 2008 Weapons are here!
If you listen closely, JimmyB is placing an order right now.