IMC, the dwarves are the only ones who have any kind of firearms. Known as "Dragons of the Deep," they are cannons used to defend dwarven citadels from other underground races. There may be some Dragons pointed toward the outside world, but these are rare indeed as they (1) make hiding the locations of dwarven citadels difficult and (2) most of the things dwarves worry about come from below, not above.
As far as hand weapons go, I'm considering it.
Side Note: I almost quit playing D&D with 2nd Ed AD&D because it wasn't capable of doing the things I wanted (specifically, running a game where modern people are transported to a fantasy world, ala Narnia or Fionavar Tapestry). You couldn't easily stat the effects of things like disturbing a hornet's nest, so people tended not to worry about such mundane concerns. I would look through my Dictionary of Imaginary Places, and nine places out of ten would be difficult to set a game in. It bothered me.
With 3.0/3.5, you can stat anything you like, and make it involved in an adventure. World with trains? Bring it on. Guns? No problem. War-Forged Titans? Hey, that's okay too.
Level progression is a bit fast for my tastes, and the basic version of the game has too much of a "video game/Magic the Gathering" feel for my tastes, but that's really easy to fix.
Raven Crowking