The whole idea that Turkey is doing this because of cast lead is really hilarious. Turkey doesn't operate from concern to palestinians. Nevertheless, it should be understood that Turkey has security concerns in Iraq, Iran and the Middle East. If this region blows up (which is happening) Turkey will be affected. There are those who argue that there is a consistent shift in the turkish foreign policy. Turkey is also reviewing it's Ataturkian legacy more logically these and she understands that she can use this the ottoman legacy to both balance Iran and project power. While it's true that Iran, Turkey and Israel were the traditional forces in the western policy that were used to contain the Arabs, but this is changing. It is not the Arabs that need to be contained, it is Israel and Islamic extremism. The collapse of the Arab world can be more dangerous to the west and to stability. My own presumption is that Turkey is trying with American assistance to balance Iran and contain Islamism.
Shin Bet arrests Meir Ettinger on suspicion of involvement with extremist Jewish group (Haaretz)
from the article: Turkey PM: My people rejected Israeli participation in NATO drill