OCHA oPt. (United Nations Office for the Coordination of Humanitarian Affairs in occupied Palestinian territories) is a good proof that despite a total lack of measures taken by its head, the UN is actually doing some very good work of information in Palestine. In fact OCHA oPt's website hosts a very precious series of maps that documents the Israeli presence in the West Bank and Gaza (borders, jewish settlements, walls, checkpoints etc.) Those maps are available for free at he OCHA office in Jerusalem (the office is actually almost on the 1949 Green Line) or downloadable online in pdf format.
It is a very useful tool for anybody working on this topic or travelling in Palestine.