Wheel bearings wearing

How can you tell if your wheel bearings are worn and need replacing?
My Aksium Discs wheels were new as of May, since then they have covered 3364 miles and I noticed this week that when I roll the front wheel in the air, it vibrates a lot through the forks, headset and handlebar. It is also a notchy vibration that is uneven. The bike doesn't maintain speed well if you come off the pedals, it looks to me like the bearings are shot.
My Aksium Discs wheels were new as of May, since then they have covered 3364 miles and I noticed this week that when I roll the front wheel in the air, it vibrates a lot through the forks, headset and handlebar. It is also a notchy vibration that is uneven. The bike doesn't maintain speed well if you come off the pedals, it looks to me like the bearings are shot.
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