An increasing number of religious groups are working for peace. Many Jewish, Christian, and Muslim organizations use a variety of tactics to lower the level of violence and bring the two sides to the negotiating table. (from http://www.ifamericansknew.org/cur_sit/rel-act-articles.html)
The USCCB provides resources for each of these four action areas:
pray for the Mother Church of Jerusalem,
go on pilgrimage to the Holy Land,
persuade political leaders to work for a just peace, and
support projects to strengthen the local Church in the Holy Land.
See http://www.nccbuscc.org/sdwp/international/holyland.shtml

http://uspartners.crs.org/downloads/holy-land-resource-guide.pdf
See HolyLand photos from the 2010 Search For Peace Art Exhibit
Searching for Peace in the Holy Land