My kids enjoy doing collaborative projects with classes from around the globe. The young ones love the idea of having epals and exchanging e-mails. The older ones love making PowerPoint/ video presentations or podcasts and exchanging them. They both enjoy blogging or using programs like yackpack or skype. We've got an internet magazine and they're very happy to write for it and edit it. I also use PowerPoint and other sotwares for making various class activities.

I hope this was helpful.