I got a pointer to Spartan Guides, a treasure-trove of organized links to web sites useful in education. The home page lists the most popular guides. Each of the guides has dozens of categories, which then often break down to sub-categories. Each final page has lots of information. For instance, the New Tools guide includes Digital Storytelling and Google Docs and Apps among its nearly 50 sub-categories.
On the Google Apps page I’d recommend two downloadable Google for Teachers PDFs. The first includes info on uses of Google Maps, including Math Maps (has placemarks with related math questions identified by elementary grade level – Kindergarten through 5th grades) and Climate Change Data (has placemarks tied to current and historical weather data). The second has a section on building custom search engines which I may use to organize links to shareable images. There’s lots more than the few items I’ve mentioned here.
The library producing the above has a wiki page with yet more information. Many of the links take you to pages done by Joyce Valenza using Only2Clicks. These pages have a thumbnail of the relevant web page for each link. There are too may good categories for me to pick just a few. Have a look.