Apologies - I generally try to keep out of these type of discussions in case I'm accused of bias or advertising. However, I'm going to break my own rules just this once
See http://www.frogtrade.com/whitepapers or http://www.frogtrade.com/casestudies - both have a number of schools, what they are doing and contact details of key people to speak with there.
I'd also like to agree with a couple of other comments, which are absolutely true whichever VLE you have - 'Linfit' is right (16/04 below), you need buy in and drive from the top, and 'russdev' (17/04) is also spot on, the implementation and planning are key aspects of success
Cheers