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UberMenu (for WordPress)?
I fully agree.
Check out the examples on their site and see for yourself.
UberMenu is a user-friendly, highly customizable responsive Mega Menu WordPress plugin. It works out of the box with the WordPress 3 Menu System, making it simple to get started but powerful enough to create highly customized and creative mega menu configurations.
The menus have worked for us in both responsive and non-responsive web design/themes. Nice work, sevenspark!