Okay...it has a strong Victorian flavor. Science, but with steam power and clockwork. Elegant brass and wood instead of steel. So, say you'd still have a raygun, but it would be more like an antique pistol than a buck rogers or star wars look.The Instructables site has some beautifully modded computer keyboards, ect.
Very drool worthy.
Think Jules Verne, H.G.Wells. And for those who dress steampunk-think corsets, top hats, elegance-but punked up and modified. It's one of those things that's hard to describe, but you know it when you see it. Retro-futuristic. And yes, we tend to like the look of gears and watch works. Check out the amazing webcomic Girl Genius-it's where my icon is from. (Although its creator prefers the term Gaslight Fantasy)
I'm a steampunk nerd....I play the steampunk mad scientist ChicGeek on another forum.