Concord977 and CedarJet. You speak the truth. Glide ratio tells the whole story.
I could not find anything on the A380, but the 747 glide ratio is about 15. However, in order to achieve this ratio, the air speed must be maintained around 130kt.
Hence if you are cruising at 30,000ft, you would be able to glide for.. let see 30,000 x 15 = 450,000ft (neglecting of course the head or tail wind). This translates into 85miles (137km.)
"According to an A380 article that appeared in Aviation Week in 2002, this aircraft is supposed to have a 10.6"
I would have expected the glide ratio to be higher for the A380. Since the article is relatively old, maybe the full systems analysis and CFD/windtunnel testing were not complete. Clearly, the A380 will have a decent glide ratio, at least greater than 10. The intersting thing is that the the weight of the plane has no bearing on how far you will glide, but how fast you will glide. hence a heavier plane will get down faster than a lighter plane, but will fly the same distance as the lighter plane, assuming they have the same glide ratio.