Nanotechnology 

http://www.research.ibm.com/topics/serious/nano/

http://www.nano.org.uk/

Science web sites:

Discovery.com - http://www.discovery.com
PhysLink.com - http://www.physlink.com/
Scientific American - http://www.scientificamerican.com/
Space.com - http://www.space.com
UniSci - http://www.unisci.com/
Nova Online - http://www.pbs.org/wgbh/nova/
The Why Files - http://www.whyfiles.org/