Geological Survey of Canada - http://gsc.nrcan.gc.ca
Provides links to various resources both within the GSC and outside. Includes an "Ask-a-geologist" page.
British Columbia - http://www.empr.gov.bc.ca/MINING/GEOSCIENCE/Pages/default.aspx
Good resources, including downloads, with a West Coast bent - earthquakes, landslides, mining, rocks and minerals, etc. Links to other organizations also.
Manitoba - http://www.manitoba.ca/iem/geo
Information on rocks and mining in Manitoba. Links to other resources.
Newfoundland - http://www.gov.nl.ca/mines&en/geosurvey/education/
Geology and minerals in Newfoundland and Labrador; natural hazards, meteorites, excellent geological glossary and downloadable digital slides of rocks and minerals and geological features.
Saskatchewan - http://www.economy.gov.sk.ca/SGS
Series of mineral posters available free to teachers.
British Geological Survey - http://www.bgs.ac.uk/education/home.html
Useful site with information and downloads on fossils, rocks, geological timescale, volcanoes, earthquakes and geo-tourism. British focus obviously.
US Geological Survey - https://education.usgs.gov
Very extensive site covering biological as well as geological teaching and learning resources.
Geoscape Canada - http://www.cgenarchive.org/geoscape.html
Excellent resource for understanding the relevance of the geosciences to everyday life in Canadian communities.
Mining Matters - http://www.pdac.ca/miningmatters
Countless resources for teachers and students that promote awareness of the importance of rocks, minerals, metals, mining and Canada
Atlas of Canada - http://atlas.gc.ca
Canada-wide maps of various natural and historical themes. Also links to learning resources about maps and geography, including downloadable maps for use in the classroom.
Geological Society of London - https://www.geolsoc.org.uk/schools
Downloadable pamphlets on various topics of geology and impacts on everyday life, online photo library, extensive links to other internet resources.
Society of Sedimentary Geology - https://www.sepm.org
Good classroom activities/lesson plans.
BBC Schools - http://www.bbc.co.uk/education
Geared to the British curriculum but material is applicable elsewhere.
The Mineral and Gemstone Kingdom - http://www.minerals.net/
Excellent resource for information about minerals, their properties and uses. Photo gallery, glossary, how to identify minerals, etc.
Our Earth as Art - http://eros.usgs.gov/imagegallery
Downloadable Landsat images of the Earth. Co-sponsored by USGS and NASA.
ESEU, Keele University - http://www.earthscienceeducation.com/
Oriented towards the UK curriculum, but some very useful downloads, book reviews, and web links.
Bureau of Geological and Mining Research (France) - http://www.brgm.fr