"why is zarqawi always refered to as a Jordanian?"
Because Jordan is the only Arab nation that made the Palistinian refugees from Israel's formation and subsequent events citizens. He was born in Jordan, he's a citizen of Jordan, despite having been born of Palistinian parents.
jordan was part of the british mandate and refered to as "palestine" therefore, it was palestine before it was jordan. jordan, the country was a gift to the tribe of the hashemites. bakshish, payoff arab style.
http://en.wikipedia.org/wiki/Hashemite