The trick to use folder.jpg images as the icon for a certain folder in Ubuntu which we wrote about some time ago only works for Jaunty. But luckily, the same Stephen O'Sullivan has found a way to make this work in Ubuntu Karmic Koala.This time, the script comes in a .deb package and it's called Cover Thumbnailer, and it displays music album covers, preview of picture which are in a folder, etc. in Nautilus. That means that it's no longer necessary to have a folder.jpg file inside a folder in order for the thumbnail to be displayed!
AC/DC - Black Ice. Brilliant album!