I agree with Eric - when it comes to macro shots, you need something to rest a camera on or a very, very steady hand. I would also suggest that your shutter speed is too low for a handheld shot. The lower the shutter speed, the more blur your photo will have because of the body's natural movement (even if you're trying really hard to sit still). Myself, I can't go lower than 1/60th handheld.
This shot looks sunny enough to have gone handheld, though. If you brought your aperture up to around f4, you might have been able to edge your way to a shutter speed of 1/30th or 1/60th. You sacrifice depth of field when you do this, so you have to be careful.
Keep it up with the macro shots. It's a very rewarding area of photography. :)
Looking at this, I'd say you need a tripod or a surface to put your camera on. It looks like you just had some serious camera shake here. if you can get back to this spot, bring a small rag or something and put your camera on the ground on the rag when you try to shoot this again.
It may also be that your lens just isn't able to focus on something that close... I know I've had problems with some of my lenses doing that. I ended up buying a macro lens just for that purpose.
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