Or, more specifically, I'm a big fan of Israel's Ministry of Foreign Affairs. Whether you're complaining about their destruction of homes and structures as they withdrew from certain areas of the Gaza strip (turns out that the Palestinians wanted the cement structures destroyed; they were planning to use them as an artificial reef in a marina project) or thanking the country for giving animals to a Palestinian zoo (they sent a few other articles on cooperation back), they respond, and quickly. They never give their names so that's a little bit rough, but they reply quickly and professionally. Great public relations!
MSNBC Article that mentions Israel's gift
Israel, Jordan and Palestinian Authority working together on large environmental project
Israel, Palestinian Authority team to clean regional rivers