Depending on the type of work you do, your office is probably a bit noisier than you would like. To help yourself concentrate, you should get a good pair of headphones. A pair that will block out all noise and deliver solid, clear sound. One that doesn't add more clutter to your life would be great, too.
Parrot, the company behind the popular AR.Drone has just that: the Zik. Wireless (Bluetooh enabled), well-built, and packed active noise cancellation technology that can block out 25dB of ambient noise, it'll have you locked into whatever you're focusing on without being distracted by things that don't concern you.