Tested in FF and IE7. Just extract the menubar folder in the Ext 3.1 examples directory.
If you go to the submenu of a menu and then back to the original menu it doesn't stop the hidemenu task.
Submenus of Long menus that get scrolled have no height.
Sometimes the activated main menu item flashes when mousing over the submenu.
Scrolled menus will fire mouseout when dragging the scrollbar.
Implement vertical menu support like the original Ext 1.x Ext.ux.MenuBar had. (Anyone wanting to do this feel free as I don't know when/if I'll have the opportunity anytime soon)