The 10-20 is good for landscapes, interiors and usually is found stuck to my D200 for most part of the time. You see a shot I took in Monaco with the lens here: http://www.cameralabs.com/forum/viewtopic.php?t=2852
I did consider the more expensive options of the 12-24 by Nikon or Tokina, but settled for this. The extra 2mm makes a difference and the cost as well. I don't see myself moving onto a full-frame for the next few years, so the 10-20 was a no-brainer. Only 2 complaints with it though - if you're using ND grads for landscapes, you can't employ stacking with this as it vignettes. I purchased a wide-angle holder made by Cokin just for using my grads. And secondly the lens cap is horrible - you can't remove it with the hood on, so I had to buy a pinch cap made by Nikon to replace it. Otherwise tremendous value, especially if you solely take landscapes.