Nanotechnology is any technology that has at least one dimension in the range of 1nm to 100nm. Nanotechnology is very old dating at least to the use of stained glass windows in medieval times (around 1100 AD) and probably earlier. This was a use of nanotechnology by serendipity.

Recently nanotechnology has grown because of the discovery (1985) and eventual production of buckyball (buckminsterfullerene, C60). A buckyball is a truncated icosahedron and looks like a football (soccer ball - in particular the Telstar). Its diameter is actually only 0.7 nm but any practical application would be greater than that diameter pushing into the nanotechnology definition.

This is still under construction, however I have links below that are pretty cool.

Lecture module for Introductory Engineering:

Introduction to Nanotechnology

Interactive tools for understanding materials (and nanotechnology):

Materials Science Excelets
Molecular Workbench


Richard E. Smalley Institute for Nanoscale Science and Technology
Partnership for Research and Education in Materials -- Howard, PGCC, Cornell, Gallaudet (2013-present)
Partnership for Research and Education in Materials -- Howard, PGCC, John Hopkins (2007-2011)
Howard Nanoscale Science and Engineering Facility & NanoExpress
Maruyama's site - gif animations of nanotubes and other cool things
exploring the nanoworld
exploring the nanoworld: Forms of Carbon - very nice Jmol page on "Forms of Carbon" including nanotubes
Center for Nanophase Materials Science
National Nanotechnology Initiative
The Nanotechnology Institute
nanoHub - online simulation and more
Institute of nanoTechnology (CRC site)
Keck Center for the Design of Nanoscale Materials for Molecular Recognition (Howard University)
Nanobiotechnology Center (NBTC)
Cornell Nanoscale Science and Technology Facility (CNF)
Harvard University Center for Nanoscale Systems
Maryland Nanocenter
Foresight Nanotech Institute
International Society for Nanoscale Science, Computation, and Engineering
National Nanotechnology Infrastructure Network
Science Museum (London)
The Opensource Handbook of Nanoscience and Nanotechnology
Nanotechnology and Nanoscience -- Honolulu, HI
Agilent Technologies Nanotechnology Instruments

NSF's Materials Research Science & Engineering Centers (MRSEC)

MRSEC national website
The PREM program

Biology Sites which have nanotechnology concepts:

DNA Nanotechnology in Ned Seeman's Laboratory - very technical

Biology Nanotechnology Articles, Abstracts, or database search engines (to find articles):

PubMed - Public database
Nano World: DNA meets Nanotechnology - not too technical
DNA Nanotechnology - technical
DNA Nanotechnology - University of Oxford - pictures and references

Demonstrations of tools for Nanotechnology:

TEM demo
More Microscope demos - Pretty neat

Nanoscience Research Centers:

The Center for Nanophase Materials Science
Molecular Foundry
The Center for Integrated Nanotechnologies (CINT)
The Center for Nanoscale Materials
The Center for Functional Nanomaterials

Nanotechnology Policy:

Wilson Center's Nanotechnology Area - Discussions
Project on Emerging Nanotechnology - Discussions
Committee on Science and Technology (US House of Representatives) - Discussions about all technology; including nanotechnology
Committee on Commerce, Science and Transportation (US Senate) - Discussions about all technology; including nanotechnology

Materials Science Sites that may have some nanotechnology:

Center for Computational Materials Science

And an education game if you wish: