I've been using the Uniservity Learning Platform for a couple of years in Warrington, both in school, and running training for other schools as an AST, and I love it. Have a look at
Grappenhall Heys Primary School ** The Year 4 teacher's page is particularly good. Teachers here love it, as there is a massive range of stuff that can be done. The projects available from Uniservity are spot on (I've just met one of my performance management targets through their collaborative projects, as I was put in touch with a Hong Kong Uniservity school to work with, and our Y4 children are now working together), and they cover objectives from YR to KS4
Once you understand the way it works, the uses of the tools are endless - we have kids in Reception using forums, talking with fictional characters, and my Y5 class have just been creating an alien world wiki.
http://http://www.school-portal.co.u...urceId=2129118, in 1 lesson.
I've seen schools using it a range of ways, from hosting useful material to use at home, to allowing children to explore their learning paths in real personalised learning. Teachers take to it quickly, because it is not massively technical. What works best is having a coule of keen people to forge ahead. Trot along to the Uniservity user events, and you;ll see load of good ideas for the way it can be used with the children.