I had heard about this, but hadn't paid much attention until I saw Jon Ihle's post on the subject and his mention of Notre Dame. All the signatories are based in Ireland except for three - all of whom are on the faculty of Notre Dame.
What's going on here? Why is Notre Dame the only non-Irish university listed? Are these three working to ban contacts between Notre Dame and Israeli universities? Is Notre Dame a hotbed of anti-Israeli sentiment?