This blog post by a teacher who's migrating his school IT system to an open-source infrastructure just came up on the Ubuntu-ie mailing list. It's happening in Northern Ireland but still goes on the list of "Irish schools using open-source" :)
That's really cool. The comments promise a follow-up post, I hope it will include advice on how the author got not only the students but also the school staff to be excited about the migration. That seems to be a major pain point within the case studies I've come across.