The thing the Pentax K10D has going for it is the fact that the anti-shaking feature is actually built into the camera body not the lens. This makes a Pentax lens cheaper than other competing brands. On the other hand, the Nikon D80 has the anti-shaking feature built into the lenses which makes for a more expensive lens purchase. There is a lot of debate about this, but I believe that having the feature built into the camera body is much better.
You don't have to tell me about the in-body shake reduction. It's nice to pull out the 35-year old 300mm f/4 prime lens, flip a switch and have the shake reduction.
And I won't worry argue about the price of K10D body versus the D80. You get the same quality image sensor, better on-body control options, and the weather sealing.... but depending on which lens you look at, Nikon wins price on one area, and Pentax in another. If you're only going to pick up a few lenses, it does pay to look at the prices of the ones you're looking at -- if you see yourself being more enthusiastic about the hobby, then chances are the differences in price will balance out in the long run.
Note that the Pentax K10D is the only digital SLR to have full dust/weather protection for the body and the lenses they currently sell.
At that price point for the body, yes (but keep in mind that it's being heavily discounted because it's on the way out the door). But I'm pretty sure that Canon/Nikon both have weather-sealed cameras available... and the K10D isn't weather sealed for everything -- there are only two matching weather-sealed lenses available right now, the 16-50mm f/2.8 DA* and the 50-135mm f/2.8 DA*. I have the latter (the only zoom in my bag) and I have to say it's a fantastic performer, but it'll set you back more than the body -- around $800 at B&H.
To those currently considering buying a digital SLR, I would suggest waiting for the forthcoming Pentax K20D - it will feature 14 Megapixel capability. I am in the market for a digital SLR and I have done a lot of reading on the D80 and the K10D. The Pentax wins out in many reviews IMO. Since Pentax is going to be updating their cameras very soon, I am going to wait for the K20D because it will be a camera to have for a long time.
Let's see what the specs actually are before recommending it. Personally, if you're looking to buy now, the K10D is an excellent value -- and it's a body that will keep you happy for quite some time, assuming you don't need the latest and greatest at all times. If you can wait a month or two, and are on a budget, wait for the K20D announcement, and buy a K10D then.
And if you have an unlimited budget, go out and buy a Nikon D3, and a Leica M8 for when you need a pocket camera.
Since I will be getting the Pentax K20D when it comes out, can anyone tell me which software is better: Aperture or Lightroom?
I prefer the LightRoom workflow, but then again, Aperture runs like a dog on a MacBook. Both have demos available, download and give them a trial spin, pick the one you like better.