I have tried to list resources to help Christians as I know them, although some places have been destroyed in the 2002 invasion by Israel.  Check first before you make plans.  The information is categorized as:

Groups to help you plan Alternative or Authentic Travel (not travel agents)

Social Service and educational institutions that might have you visit or furnish a speaker.

Church related agencies sponsoring development work

Rights groups of all kinds (both Israeli and Palestinian)

Fair trade stores (places which pay the craftspeople a living wage and supervise their work.)

Bookstores (especially for material about Palestine you cannot get anyplace else)

Commercial resources (hotels, restaurants, travel agents) 

Click on one of these categories on the left or go to the Site Map in the header.