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Encyclopedia of Earth, an electronic reference about the Earth, its natural environments, and their interaction with society. The Encyclopedia is a free, fully searchable collection of articles written by scholars, professionals, educators, and experts who collaborate and review each other's work. The articles are written in non-technical language and are useful to students, educators, scholars, professionals, as well as to the general public.

Trailmeme is an interesting new service that could be described as social bookmarking meets social mind mapping. The basic idea behind Trailmeme is that we all have our own way of connecting the things we find on the Internet when we research a topic. Trailmeme provides a way to record those connections and publish them as a mind map or flowchart that Trailmeme refers to as a "trail." When you publish your trail publicly other visitors to Trailmeme can "walk" the trail you created. Walking a trail means that you follow the map of labeled links created by another person. 

Cheat sheet is a concise set of notes used for quick reference. Cheat sheets will contain most of the shortcuts needed to program faster. And it is meant for newbie users who can't remember the shortcuts or commands.

UsingEnglish.com provides a large collection of English as a Second Language (ESL) tools & resources for students, teachers, learners and academics. Browse our grammar glossary and references of irregular verbs, phrasal verbs and idioms, ESL forums, articles, teacher handouts and printables, and find useful links and information on English. Topics cover the spectrum of ESL, EFL, ESOL, and EAP subject areas.

The Avalon Project will mount digital documents relevant to the fields of Law, History, Economics, Politics, Diplomacy and Government. We do not intend to mount only static text but rather to add value to the text by linking to supporting documents expressly referred to in the body of the text.

OnlineLabs.in aims to serve as a comprehensive, encyclopedic reference about online labs in a variety of subjects, particularly virtual laboratory simulations for science education. We categorize useful listings for online lab simulations, virtual science experiments and free educational software.

A very comprehensive conversion site.

I really liked her article. Saved it for future reference!

Which is right for your project:  Blogs, Wikis or Google Docs? A nice comparison chart.

Helpful cheat sheets for Google products.

Music Theory is an excellent site by Ricci Adams designed to teach different aspects of music such as: exercises, lessons, and tools. This really is a great site for music teachers as a user can use custom made tools for their lessons.

Scirus is the most comprehensive science-specific search engine on the Internet. Driven by the latest search engine technology, Scirus searches over 410 million science-specific Web pages.