There are many ways to tidy up loose cables and hide them underneath a desk. This idea from Walter Glen at Lifehacker used the metal rings of a broken three-ring binder. I like it because it is cheap, it recycles materials and the clip rings make it easy to add or adjust cables later on.
It will screw into the bottom of a desk or any other solid surface, so it is useful for standard desk-chair workstations, but also flexible enough to use on less traditional set-ups. I think it might be a great solution for my recliner-desk set-up if I attach it vertically to the back of the trolley I am using as a desk.