I am just not a fan of drop down menus. I think they should be avoided at all cost. They don't always work in every browser and they can become a usability and accessibility issue. Jeffery Zeldman sums it up nicely: http://bobchristenson.tumblr.com/post/38016909/when-i-see-a-drop-down-menu-i-know-that-a
What are your thoughts on drop down menus?