I'm pretty, pretty sure that there is an option somewhere to enter the path to the default-thumbnail which yould be displayed in those cases where no "post thumbnail" has been set. I know that because my installation is set up to do exactly that. But now I would like to change that path. Where is that? I thought it must be somewhere in Atahualpa. I did not modify the functions.php for this...
Also I tried to use the "Crop Post Thumbnails" option in Atahualpa. What I want to achieve is to have a uniform width x height of 300 x 200px and for all my excerpt images (which will be the post thumbnails). But entering these values on the Atahualpa "Post Thumbnails"-options page and, of course, turning on "Crop Post Thumbnails" does not achieve that. What happens is that the thumbnails outside of the 2:3 ratio will just be scaled so that ONE dimension fits the target size - no cropping.
I am using Ata 3.5.3, WP 3.0.4