Metal Sound Design is one wild speaker company out of Korea. While the technical (and company) details are slim to none, Metal Sound Design's deft CNC skills are truly stunning. The Planet speaker above is getting some press, but it's hard to tell if it's an actual production model or a concept. Price is said to be around $50k and rocks those Accuton ceramic drivers and diamond tweeters. The midrange/tweeter cannon on top swivels around because it's cool like that.
Check out these other (conceptual?) speaker designs and visit the site for more audio eye candy.