What is the best Mega Menu extension ?

You won't find better solution than Mega Menu extension by Mageshop !

Mega menu extension help to display categories and corresponding sub-categories in different columns which are classified clearly.
Easily select Main category of menu’s item on a user-friendly interface
Able to restrict sub-categories and level of category on one menu. Allow and disallow which category to display within the dropdown menu
Able to add thumbnail image of each category to the dropdown menu
Able to display whatever content format within the dropdown menu, such as video, flash, html…
Attached Editor makes it possible to process content with a peace of mind using available tools
Allow to insert whatever widgets (similar to widget insertion of a CMS page)
Broaden the option to add widget to select any products to insert into the dropdown menu
Support dynamic URL usage in the Editor
Allow to insert images into the dropdown menu
Able to add, delete, edit, re-arrange the menu’s order without any difficulties
Easy to manage and customize the dropdown menu
Possible to add static content to display in line with the list of sub-menus (changeable position: above, below, left, right in accordance with the sub-menus)
Manage the navigation of the menu flexibly
Able to assign menu’s item to different stores
Able to select time duration to display the menu’s item
Able to add class to the menu’s item (supports developer to edit style of the menu)
Plenty available themes to select (7 themes available, more updates to come)

Best Magento extension with affordable price of $ 39 click for more details : http://www.mage-shop.com/megamenu.html