Communication is the name of the game!

Crack into pdfs -legally.
http://freemypdf.com/
My favourite free mind mapping tool- can be used collaboratively at the same time: http://www.mindmeister.com/ Seriously- this is one to try. Children can share mindmap online - updates without refreshing!
2 connect
http://www.2simple.com/2connect/
Even more in the Cooltools4schools wikispace
http://cooltoolsforschools.wikispaces.com/Presentation+Tools

Brilliant presentation tool- add audio to make a webinar!
http://www.slideshare.net/
Don't forget the fabulous E2BN presentation tools_
Discovery box
http://discoverybox.e2bn.org/

Describe a journey using photos and video
http://mapvivo.com/

This isn't communication unless you count playing an instrument- for the wannabee rock musicians
http://gigajam.e2bn.org/