This site allows you to make creative word clouds, which would be an interesting project or lesson (it would appeal especially to the visual learners).

This is a cool tool for creating timelines, which can be used with any subject. Once created, you can use this site to share them.

Resource for digital storytelling. Details how it can be useful in education, including tutorials and software.

Over 1,000 videos of presenters at the TED Conference. The presentations cover all sorts of subjects, and are usually amazing and inspiring. These are a great way to spice up a unit or to incorporate into a related lesson.

Edutopia has all kinds of resources for all types of teachers. It's a source of news, core strategies, classroom guides, and discussion about education.

This website is a valuable source of all types of educational games. The games come in formats that are compatible with most classroom computers (Word, Excel, Powerpoint, etc.). These games can be used for all subjects and all levels of teaching.

Bibliomania is a resource for free literature texts, especially classics, in an electronic format. This is useful for english and maybe history.

"Fakebook" allows teachers/students to create fake facebooks. I've seen this used and have used it in the classroom myself, Fakebook could be useful for all subjects, as it allows students to create a virtual facebook for anyone (characters from a novel, people from history, etc.)