Hi EduGeeks!
I work for OSS Watch, a Jisc-funded service providing unbiased advice and support for open source in UK education.
We're currently working on a document called "Open Source Options for Education", which we're creating to complement the UK Cabinet Office's own "Open Source Options" document, with much the same aims outlined in that document's introduction. The real difference is that we're looking specifically at software that's relevant to educational establishments (i.e. not general purpose OSes, network tools, office software etc).
My reason for posting this here is that we'd like to open up the document for comment and contributions before we create the publish the final draft on our website. You can view and edit the document in it's current state at http://oss.ly/osoed or
https://docs.google.com/document/d/1Fh7z6Oz4tBK5yvhjdf3UIRjmhJZrO5SJFFIUngLRaF4/edit (Not shortened)
I you feel you've got something valuable to add in the form of software we've missed or good examples of real world usage, please do so. If you've got any general comments and observations, you can add them in the document's comments or in this thread.