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You need to sharpen your images.

It sounds like you're trying to avoid doing post-production work on your shots by letting the camera do the work for you - not a very good strategy for producing commercial imagery.

I now use in camera sharpening whit my D200, after I notice about the same thing...It was always seem to be out of focus at 200 and 300%. After a week or two, some people on other forums was talking about if the D300 was going to sharpen more than the D200, like Canon do.

It was a problem for them. Personally, I'm not a great photoshoper and I use an old version of photoshop (6.0). The sharpen filter in photoshop 6.0 do a poor job. So unless someone give me a better version, I use and only use this in camera setting to help my pictures been selected. I know there are probably some better way to sharpen a picture, but this one seem to work.

A certain amount of sharpening is often necessary as images staright from DSLR cameras are invariably soft due to the AA filter.

They also lack dynamic range.

I've found with my Nikon D200 that a normal levels adjustment changes the perceived sharpness of an image, presumably due to the increased contrast.

I would have thought that even Photoshop 6 had 'unsharp mask'.  This tool is often criticised and derided, but that's probably because people don't spend enough time learning how to use it.  Just changing the 'amount' isn't using it to its full advantage - the 'radius' and 'threshold' adjusters are powerful tools and can be used to create just the right amount of sharpness depending on whether one is trying to sharpen small details or a large scene.  Some time spent learning how to use 'unsharp mask' with a variety of different settings and a range of images will be time well spent.

Selective sharpening is also useful - for this I tend to use 'quick mask' but others probably have their own preferred system.

Really?? I thought "unsharp mask" was an industry standard (at least for print production). I always use this and never use the regular "sharpen" tool in photoshop. I have used "unsharp mask" for years and I am pretty sure it is available in PS6.