roughly btw 250-500,000 palestinians fled and some expelled as a result of Arab agression against Israel. Secondly their decendants are not factored into any equation and certainly will not be able to return to Israel. Its a mute point and the sooner the Palestinians realize this and move on the sooner peace can be achieved. Its this sense of entitlement that is hindering any final agreement.
Protests in southern Syrian city after Druze cleric's death (AP)
from the article: Haaretz exclusive: Olmert's plan for peace with the Palestinians