Unfortunately, IE's poor suport of the hover pseudo class means that it'd take scripting to make such a menu work in IE (a la suckerfish)
There's also plenty of cool nested menus on listmatic 2, although I'd check the browser support chart before using any of them.
Disclaimer. (1) Whilst I will help you sometimes, if I feel like it, and my advice in relation to your actual question will be of good quality: my posts are to be taken with a pinch of salt. I will be sarcastic, deploy irony and include obscure cultural references for my own amusement without warning.
(2) You will gain nothing from complaining, and if you try to argue with me then you will not win. No matter how noble your battle seems, I am still better than you, don't be an hero.