Osama Bin Laden has just called on Arabs, especially Palestinians, to support the Palestinian struggle by joining the insurgency in Iraq. He called this "a major duty for my brothers the Palestinian emigrants" because Israel's "barrier" makes attacking Israel difficult.
http://news.bbc.co.uk/1/hi/world/europe/7307796.stm Did he speak with inside knowledge? Robert Fisk recently noted that "most" suicide bombers travelling to Iraq from Lebanon are Palestinian.
From
http://www.independent.co.uk/news/fisk/robert-fisk-the-cult-of-the-suicide-bomber-795649.html: ""It's difficult to reach 'Palestine' these days," Khaled's uncle informed me. "Iraq is easier.""