I came across this article called Back to School with the Class of Web 2.0: Part1
which lists a lot of tools available on the Internet to teachers and students -
such as organizers, calendars, note taking, learning and research and so on.
I hope that some of you will find the resources in this article useful.
Don't forget to read the comments where readers have added a bunch of
sites that the article did not cover.
Here another one that the teachers would find useful:
It is a free web meeting site (for max 20 people in room).
There is nothing to download/install. You just sign up (create a username and password) and start using it!
You can even share your desktop or PDF files and it has the usual whiteboard.