Nice list of reasons to use collaborative work
 44 benefits of collaborative work
Just discovered Drop Box- heard of it before but never really thought of using it. The sharing aspect would make it great for collaborative work too.
https://www.dropbox.com
How about a collaborative online database?- Mango data is reasonably priced and the most intuitive I've used with children
http://mangodataonline.com/

Great site for free online books for putting on itunes
http://www.audioowl.com/
This and more on this blog
http://blog.learningtoday.com/blog/bid/28291/Hear-This-3-Free-Resources-for-Audio-Stories-for-Students

Great sit for all things ecological- this list would be great for engendering discussion in the classroom- 9 not so daft things to save the planet
http://ht.ly/1HaML

Lexipedia

Brilliant way to understand words and their multiple functions

http://www.lexipedia.com/

Photographs

Great slide show program to show slides very quickly
www.photopeach.com

Sounds good- ways to use sound in the classroom

10 ways to use Audacity in the classroom http://bit.ly/bgK6q5
Easy speak microphones great quick recording for little hands- from TTS
http://www.tts-group.co.uk/Product.aspx?cref=TTSPR1081690

Games based learning

Had a few interesting days considering use of Second Life to attend virtual ICT education conferences. Only problem was that 'SL' time- which is the same as Pacific Time is eight hours behind us. I have not been motivated yet to get up at 3 in the morning to find out what is happening.
On the subject of games based learning I had the pleasure of hearing Dawn Halleybone at ESIS talking about the use of games consoles in the classroom. Her blog is an inspiration.
http://hallyd.edublogs.org/tag/wii/
See also:
http://www.ltscotland.org.uk/ictineducation/gamesbasedlearning/

I am going to set up a Wii based project using the 'Endless Ocean' software in one of my schools: should be interesting.