A Swedish design (those pesky Swedes....), the Dux Bed claims its fame from the huge multiple of springs in each mattress: 3,600 springs compared to the up to 900 springs found in conventional queen-size mattresses. This allows you just the right amount of firmness and softness so that your spine is straight and not bent.
Dux Beds come in a few different configurations, are extremely well made, have tons of springs and top layers of latex to conform to the body (think memory foam/viscoelastic). A queen size will run you from $6,500, but should last you 20 years..... What's not to like?
(Re-Edited from post on 2006-02-16)