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There are more filaments from various materials available for 3d printing then just simple PLA and ABS. Here are some links on news related to filaments ...Excellent roundup post by NothingLabs on various filaments, how to print with them and their properties:
http://nothinglabs.blogspot.com/2013/09/filament-roundup-3d-printing-in-all.html
Here is his detailed presentation from google docs: http://tinyurl.com/kq3sbjd
Color changing and magnetic metal infused 3d printing filaments
http://printm3d.com/filaments/
New flexible material - Filaflex
http://recreus.com/
Hackaday video from Maker Faire 2013:
Extensive test of soft PLA (FlexPLA):
http://algorithmicart.wordpress.com/2013/08/22/3d-printing-with-flexible-materials-flexpla-tests/
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