The 
lazy 
days 
of 
summer...

http://wblrd.sk.ca/~digital_sask/

This website is an image, video and sound exchange (there's only one sound file so far). All images and media are completely copyright-free, so you can use them for non-commercial purposes without fear of copyright infringement. Since it's an exchange, you can (and should!) submit, or have your students submit, work for others to use. A great idea! 

Connected Mathematics

http://www.math.msu.edu/cmp/

A project- and problem-solving-based approach to middle school mathematics, Connected Mathematics provides a complete middle school mathematics curriculum, much of which is available for download (look at the "Resources" link). Included are transparencies, software, and support for the use of them in instruction. There are also inexpensive (they're not free, but close!) video-tapes available for use with the curriculum from "Modeling Middle school Mathematics," with viewable clips available on line (QuickTime format). Funded by the National Science Foundation, coordinated by Michigan State University, and originally produced by five university professors who receive no royalty fees.

The Library Spot

http://www.libraryspot.com/

It's a dot-com, but it's low on ads and otherwise free. "Published by StartSpot Mediaworks, Inc. in the Northwestern University/Evanston Research Park in Evanston, Ill., LibrarySpot.com is the first in a family of vertical information portals designed to make finding the best topical information on the Internet a quick, easy and enjoyable experience." It's aimed at teachers, students, school and public librarians, and parents, and includes lots of links to on-line reference sites and other resources.

The Mad Scientist Network

http://www.madsci.org/

Ask a question! Get an answer from an expert! Watch your question grow! Browse the archives for others' questions! This interactive website is administered by Lynn Bry, of the Harvard Medical School, and Elizabeth Millard of Washington University, with a stable of experts from across the globe. The archives are searchable by subject and grade level, and no email address is required to register and submit a question, so it's kid safe!

http://www.nfb.ca/sedna/index_en.html

Sponsored by the National Film Board of Canada, this website charts the Sedna's Arctic exploration mission. The Sedna is a modern three-masted schooner, and the voyage will cover the entirety of the Canadian northwest passage, ending in Vancouver in late October. The website includes film clips, maps and charts, an animated voyage tracker, comments from the crew, lots of pictures, and even some hand-sketched animations! For teachers or classes wishing to join the "virtual crew," updates can be sent by email, and there are other instructional resources available. [editor's note: This voyage is finished. Link has been updated for further developments.]

Bartlett's Familiar Quotations

http://www.bartleby.com/100/

Yes, it's the real thing, with a searchable database! Students can put in key words, and retrieve that great quote for use in their writing. Part of the Bartleby.com web group, which includes full literary works and other reference resources on line. Expect some banner ads. Also available through Yahoo and Yahooligans as a part of their reference sections.