I have spent so much time trying to improve Khmer Voice using Drupal. So far, i find that Drupal has more features than DotNetNuke by comparison but then I have spent much much more time with Drupal than DNN. However, I must admit that there certain features that I like better in DNN than Drupal such their forum features (in DNN). But overall, Drupal seems to be lighter and faster.
Right now, I am trying to work on the Search and photo gallery features on Drupal. I haven't been able to get it working yet... and i am feeling beat already. Will continue this tomorrow.