This ever-growing curated collection of interface patterns on CodePen is a reliable source of inspiration.
I’m no fan of mega menus, and if a site were being designed from scratch, I’d do everything I could to avoid them, but on some existing projects they’re an unavoidable necessity (the design equivalent of technical debt). In those situations, this looks like a really nice, responsive approach.
An entertaining presentation from South By Southwest on the UI element of last resort.
It’s funny because it’s true.