Let me help Belkin help you with their latest product announcement the In-Desk Grommet USB Hub and In-Desk Grommet iPod Dock Station. Every now and again, a real great idea comes along and I believe this is one of them. What I like about this solution are the side spaced so you can still fit your other cables, like monitor and keyboard connections down through the desk grommet.
At $39 the Belkin In-Desk USB iPod dock station and hub are a fair price. Belkin also has two other “flat” models available. Grommet size solutions are standard 2 inch and 3 inch holes. I was going to click the Buy Now button, but Belkin is just prepping the market, nothing is available just yet.
Source: Slash Gear, Belkin In Desk USB hub & iPod product page.