A lot of interesting information on CNN site.

Of particular note is who's paying the bills for the Palestinians and who isn't:

The United Nations runs the camps, but other nations foot the bill. Most of the $414 million for the camps last year came from European countries, $123 million (or 30 percent) from the United States, while Arab countries -- including Saudi Arabia and the Palestinian Authority -- paid a total of $7 million.

These people are political pawns. They can't go where they want in Israel, and no Arab nation will let them into their countries. Anyone living in a "refugee camp" for fifty years is being kept there on purpose.