A Japanese researcher has spun thousands of strands of spider silk into a set of violin strings, which apparently have a “soft and profound timbre.” They were stronger than aluminium-coated, nylon-core strings. This is probably accuse of the way that the individual strands fit so snugly together.
More facts on spiders – spiders have brains in their legs, and genetically engineered silkworms can spin spider silk.
Geek science fact of the day 
There are also these really freaky genetically modified goats that produce spider silk instead of milk. Really.
There are – read about them here http://news.bbc.co.uk/1/hi/sci/tech/889951.stm and here http://www.eurekalert.org/pub_releases/2002-01/nbi-nau011102.php.
The spider silk the goats produce, called BioSteel (http://www.eurekalert.org/pub_releases/2002-01/nbi-nau011102.php) was being made into fibres and fabrics.