Very interesting, this. A group of Palestinian Christians have gotten together and written a very interesting document detailing their belief that the Israeli occupation of the Palestinian territories is unjust. It is a powerful document, and they make a good case.
Here is the main website, and here is the PDF file.
As with anything, it should be taken with a grain of salt- there have been outrages committed by Palestinians as well (as they acknowledge briefly), so there is fault on both sides.
Take the position of both sides, and somewhere in the middle, that's where truth lies.