This piece by Juan Cole is well worth the read, if you've got a few minutes to spare. It's a detailed analysis of why the idea of Iran cooperating with Al Queda is just a load of crap. It's been obvious for at least a year that Iran is the next target (remember "Everyone wants to march to Baghdad, real men go to Tehran"?). Read this so you not only know why that's a really bad idea, but you'll be able to back up your argument with facts.