On my homepage, http://www.newmediarockstars.com, you can see that the featured thumbnail gets displayed a few different ways. However, it doesn't show up correctly in a few locations.
If one looks at a story on the homepage, the thumbnail appears properly shrunken and cropped. However, if one were to click on any category from the top menu (Movies for instance), the list repopulates and the exact same story will show up in the same exact styling, except now the thumbnail is mis-sized. It still appears cropped behind the thumbnail cell window, but it is clearly loading a full-size version of the image rather than the thumbnail.
Another instance of this happening can be seen by returning to the front page, but in the right sidebar, seeing the "Must Read" column. In that list all the thumbnails are showing up as Full Size images, behind that cell window.