nail-in clips are very easy to find at almost any hardware store or at shops like Target. What you want to do is guide your wires behind your furnishings or under rugs when the option allows. Also, consider possibly leading longer cables and wires from the inside of walls if possible; we've run cables and wires through ceiling, floors and walls, effectively hiding them away from sight. Taking a look at your current setup, you could mount surge protector underneath or on the side of your shelving, and drill a hole for the wires to lead behind the furniture, rather than around it. Twist tie your cables and wires for a more unified look, and hide it away; there are a myriad of products designed to effectively hide away and guide your wires and cables.
An off the shelf solution is something like Wiremold, a solution which camouflages your cables behind a paintable guide. Also take a peek at a previous reader's question regarding hiding a flat panel television; dangling wires were addressed with recommendations for products like Belkin's Hide Away Cord Concealer and the Vantage Point WC60W Paintable Wire Cover System.attractive surge protector can also hide your cable clutter away, making what was once a Medusa's head of ugliness into something more aesthetic and clean lined.