Skype - - with an account you and your students can contact and collaborate other teachers/classes by phone of videocam for FREE. What a collaboration opportunity!

Skype and WIKIS -

Skype in Schools -

Watch this amazing video (click on the image) -- about using Skype. Students in this class are in contact with a classmate who cannot attend school because of leukemia.
Learning is Messy

Here is a little booklet the learn the ins and outs of setting up and using Skype.

Here is a great YouTube video using Skype in a cross-cultural situation.