From an intellectual property standpoint the increasing use of and lack of use of security around Javascript means there's quite bit out of code out there exposed and just aching to be stolen or otherwise tampered with. 

An extremely simple and responsive jQuery plugin that allows you to create multi-level drop down menu with subtle effects (sliding, fading, scale up, or scale down).  Each sub-menu in this menu will be shown in its own context, making the “parent” level disappear, good for saving space for menus which have a lot of content