Not sure if there's anything online, but the February 05 Smithsonian has an article on Christo & Jean Claude and the gates; the pictures of his other works in it are gorgeous. I'll see if I can find it online.
Ecco! This will open a pdf, the only way you can read the whole thing. But sadly--no pictures. They really really
really want you to buy the magazine!
http://www.smithsonianmag.si.edu/smithsonian/issues05/feb05/pdf/christo.pdf
Osso, sorry to hear about your first exposure to Goldsworthy. Totally get it--especially from an artist! I only came upon him about 3-4 years ago. The leaf thing-lame. Never knew of this, only the rock arrangements, arches and works along that line.
There's a guy in California who has created lovely earth sculptures, he was on
SPARK*, a local PBS show on local artists, who does some intense work that he installs and builds with the community. Very interesting. As the pieces age, they take on new life (literally and figuratively) as people leave and animals move in and insects discover it.