Interesting article in Scientific American September 2006. A great Special Issue ' Energy's future beyond carbon'
It appears that normal superconductor cables (BSCO) are now being developed that will see a moving away from the use of silver. These new ribbon YBCO cables do not need to be sheathed inside silver. This has always been the main reason why i believed silver to be a great hold for the future but now I'm not too sure, Anyone else have any comments or knowledge of this ( I would type out the whole article but its a bit long)
This link gives a flavour though
http://physicsweb.org/articles/news/10/7/11/1