The top box has some padding issues when hovering the contained links: there's more padding on the left than on the right, and the first link has more padding on the right than the next two (tested in latest stable Chrome & Firefox). See screenshot: http://polyprograms.free.fr/tmp/DuckDuckGoPaddingTopBox.png
On an unrelated note: I have a hard time taking your service seriously because of the duck branding and the DuckDuckGo name. It looks like you're doing a great job but somehow DuckDuckGo doesn't feel like a name for something I would use on a day-to-day basis. I guess I can just overlook it if the service is good enough but I do wonder if your brand is hurting your service. Maybe it's just me though!
We've had endless brand name discussions from the beginning :). So duly noted!
Your point is well-taken, but I think it's just a matter of normalizing the name. Granted, "duck, duck, go" doesn't roll off the tongue as smoothly as the other services, but I'm not sure that's a critical issue.
But I guess it's a minor concern indeed. I just wouldn't feel very confident using a similar name for a product of my own, knowing that it could be a turn-off.