ProCon.org is a site devoted to a nonpartisan and educational stance on 39 controversial issues, including this debate. They feature, through direct quotes, the opinions of many respected individuals without taking opinions of their own. The information they provide is quite expansive and ranges from specific land disputes to a comprehensive history of power in the region.
The Alternative Information Center is run by Israelis and Palestinians together with the objective of acting as a bridge between cultures and promoting "just peace for Palestinians and Israelis based on progressive principles and respect for international law." What I like about them is that they find the socioeconomic and cultural issues equally as important as their political context.
Foundation for Middle East Peace is a nonprofit organization that is striving for peace between Israel and Palestine that is just for both parties. They publish the bimonthly Report on Israeli Settlement in the Occupied Territories, which is distributed for free through email or by postal mail (if people still use that ) to subscribers.
The Israel Palestine Forum is something much like this, although much better established, which has some interesting posts that you can look through and join in on.
That's all for now!