The concept of Steampunk is a combination of sci-fi and fantasy. The origins of Steampunk are found in the works of such authors as Jules Verne and H.G. Wells, where modern or future technology is inserted into a time period in which it did not originally exist. If you watch The Legue of Extraordinary Gentleman you get the idea.
As far as fashion is concerned, steampunk is a fusion of an ornate, Victorian style and convenience of modern technology. I love the look below of a completely Victorian era top hat with a set of old fashion yet at the same time futuristic pair of goggles. Gypsymoon is an online retailer where you can find items with Steampunk flair. Clockwork Couture also has loads of Steampunk sytled clothing and really reasonable prices.
Some Steampunk works take on a kind of an “alternate history” path, where technological accomplishments such as computers are assumed to have been created at an earlier date. Take the computer featured below. Brass, vintage typewriter keys and an ornate sensibility.
Steampunk design is ornate and detailed and can be a refreshing change in the age of more modern design and utilitarian construction. The most well-known steampunk computer modification is from Jake von Slatt at the Steampunk workshop. People who crave modern technology with unique craftsmanship may find it in Steampunk.
I mean, who wouldn't want a Stempunk Vespa?