WordPress plugin that integrates sticky.js and makes your primary navigation menu sticky
Works nicely, love it =D
Installed, and it works as simple as that. No configuration required. Only improvement I think it needs is to scroll the menu to the top and then stop, rather than jump it. Other than that - great.
Works well with most themes I've tried it on. Has saved me a lot of time when making my menus sticky, great for mobile devices.