GaijinBiker at RidingSun asks why we haven't been attacked since 9/11. Some commenters suggest Al Qaeda is deliberately aying off, and wants us in Iraq.
Osama may indeed want us in Iraq. He wanted us in Afghanistan, too. Remember the "graveyard of superpowers?" They've blown some people up in both places, but have been totally unable to stop the progress of consensual gov't in either country. Osama is not a strategic genius by a long shot. He's just a religious wacko, Jim Jones with exploding Kool-Aid drinkers.
That said, there is probably some truth to the idea they are deliberately not targeting America. We've taught them attacking America has very bad consequences; 9/11 had exactly the opposite effect on American policy of what they intended. They know more attacks will only further inflame American support for war -- at least, as long as there's a Republican president. Attacking Europe, on the other hand, has worked out better for them.