In response to novalis's theory about Asmodean 's killer, he said that it couldn't have been a male because Rand would have felt it. Yes that is very true. But on that note, don't forget that Rand can feel women channeling too. Remember in The Shaddow Rising, when Elayne and Egwene were talking with Rand about Saidin and Saidar in Tear, and he could feel them channeling but they couldn't feel him. So if it was a female, Rand would have felt soemthing. Also, why would Asmodean fear Graendal?
Maybe this particular theory will be cleared up in the final few books.