The first two things you must always keep in mind when reading reviews regarding cameras is that the most important factor of all is not in any review, which is how the camera feels in your hand, and that, for the most part, camera differences are minuscule. Cameras have different viewfinders, different sizes and button layouts that will impact how you take a picture far more than issues of sensor size or camera software.
Now, regarding macro: the best way by far of doing macro work is having a true macro or almost true macro lens. The d3000 comes with the 18-55 kit lens which has a magnification of 0.31x, which is not bad, but won't get you really close to small things.
Unfortunately, many manufacturers attach the label "macro" to far too many lenses, so check the actual magnification of the lens. "True macro" used to mean a 1:1 magnification (or 1x), where the lens "projects" a life size image into the sensor. A 1:2 lens should be good enough for most things. The cheapest macro lens in that category for the d3000 is the Tamron 70-300mm f/4-5.6 Di LD at about $170.
So if macro is important to you, I can suggest an alternative. The olympus e620 (or the olympus e600, which is about to be released and is basically the same thing minus a few minor details). The key advantages for macro for the e620 are that the LCD of the e620 is of the "tilt/swivel" variety, making it easier to take macro pics at awkward angles (the nikon d5000 also has it, but is about 200 dollars more expensive), and that the olympus has the zuiko 35mm macro lens, which gives you "true" macro magnification of 1:1 for about $180 (nikon's cheapest "true macro" lens is about 280).
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