Just because a product seems perfect doesn't necessarily mean there isn't room to squeeze just a little more usefulness out of it. Take the humble binder, or bulldog clip, as it's often called. Its simple design lets it keep giant stacks of paper in order, prevent loose cables from sliding off your desk—but with a tiny design tweak, it can also serve as a handy spot to hold a cup of coffee.
Animi Causa's $12/£8 Cup Clip can still be used to secure documents, but with its re-designed arms it can also serve as a cupholder when clamped to the side of a desk, or a hook for hanging a bag or a jacket. It works on any desk up to 3/4-inch thick, and can be instantly and easily repositioned wherever it's needed. [Animi Causa via 7Gadgets]