The small white storm on Saturn that amateur imagers have been capturing for the last few weeks, has now been captured by the robot spacecraft "Cassini" as it's orbiting Saturn.
Check this link for the news and a picture
http://apnews.myway.com/article/20060215/D8FPC9K8B.html
Awesome stuff.. Apparently from those that have been imaging it, it's just not a visual object.. most likely there's not enough contrast between the white storm and the pale yellows and browns of Saturn's belts for our eyes to pick it up.