Good camera but software support is disappointing
As many other reviews confirm, this is a good digital camera. After buying mine, however, I was disappointed to find that Nikon provides very poor support to users who do any kind of software post-processing with their pictures.

Nikon again changed the file format for this camera versus older models. As a result, most of the software you have probably won't work. Not only do you need the newest versions of Photoshop or Photoshop Elements if you're using Adobe products (ok, Nikon might argue that's Adobe's problem, but then, they provide no support to Adobe) - but wait, even your own Nikon software may not work at all! Neither the older Nikon Capture 4 photo editing software nor the relatively new Capture NX can read files shot with your D90! Nikon's technical support say there's nothing they can do about that and I should buy (0) or upgrade (0) to the newest version, Capture NX 2. In my case, all I'm using my Capture software for is to de-fisheye pictures taken with Nikon's 10.5mm lens, which worked well with my previous Nikon cameras. No more.

I consider Nikon's attitude unacceptable and warn everyone that you may end up having to spend much more than you thought if you want to use your D90 as most people do!

Amazing Camera
I got this camera about a month ago, and just love it. It doesn't just take pictures, it does video, which is sooo cool. You can also put it on commander mode, and use a sb600 speed light and use it for strobe lighting. A lot of great features, and all the essential options are outside the camera, so you can change them at the click of a button or dial.

The quality of the images are also very clean. But this will be my last nikon camera, I will probably not upgrade from here, because my next purchase is going to be a hasselblad, medium format camera. But Love Nikon.

Trying to provide some new, useful information
This camera may be the best choice for anyone who is shooting things that don't move quickly (scenery and old people) and a great choice the rest of the time (taking pictures of sports and kids).

What is particularly great about this camera is that it has outstanding high ISO performance. What that means is you can set the ISO to a high number which allows you to make properly exposed and entirely acceptable images in poor light with a relatively fast shutter speed. A lesser camera with the same combination of high ISO and fast shutter speed would result in a grainy (fuzzy) picture.

What is a very little bit less than great is the shutter repeat rate and response is a bit slower than the next best Nikon, the D300. To go up that small step will cost you 50% in dollars and give you a heavier (albeit weather sealed and more durable) camera.

If it's any guide, National Geographic travel photographers are leaving their D200/300 cameras home and taking D90s. Glaciers, after all, don't move *that* quickly. (I realize that the glacier guy uses Canon equipment but we should forgive him and move on.)

If you don't mind the additional weight and cost then there is no reason not to buy a D300. (OK, there are some nitsy user interface issues but I can't imagine how that would change anybody's mind.) Otherwise, you may be better getting a D90 and spending the difference in glass (lenses).

Love it!
I love all of the features of the D90. I was disappointed with the seemingly limited-selection of lenses that were available with the D40, which was the main reason that I got the D90 instead. I really enjoy the screen on top of the camera, it is a lot easier to see settings at a glance. For my level of photography interest, I don't think that I will ever outgrow this camera.

The only problem I have had so far with this camera is that when I am trying to hold the camera with just my right hand, often times the palm of my hand opens up the door to the data card. I just hope that it never happens at a time when the camera is processing an image. I wish it had some sort of lock on it.

Great camera
I needed a replacement for my old D70s and after a lot of research including D300, D200 and comparable Canon cameras, I decided to go for the D90.
It basically does everything the D300 does (I used the D300 from my father for awhile) for a much lower price and you get the lighter and smaller body as well.
In term of sturdiness, it is on par with the D70s. It might not be as solid as semi-pro cameras (where they use magnesium alloy and seal everything to protect from rain/humidity/dust) but it feels very sturdy: it's build to last.

Images quality is at least as good as D300 and much better than the D200.

I didn't buy the kit because I already had a couple lenses and because the 18-105 VR is nothing special. It's better to invest in a good lens that you can resale later than buying a cheap one with plastic mount that nobody will ever want to buy from you. Remember that your camera won't be worth a penny in 3 years but your lens will still be worth 70-100% of today's new price.
Better go for the nikkor 16-85 VR + 70-300 VR or nikkor 18-200 VR. The 18-50 2.8 from sigma is actually a very good lens (fast and small) as well for a very reasonable price.

Bottom line, you can't go wrong with this camera and because of its small body, you won't hesitate to take it everywhere with you.