I just downloaded the nightly build, 2.9. I created a post with an image and set the image as a thumbnail. Is the thumbnail now supposed to appear with the excerpt on the front page? On the archive page? Or is a bit of code needed in a core file for it to work?
From Doug Campbell's article:
Post Thumbnails: add an image to be automatically displayed with the post in various views (main page, archives, etc.). The WordPress logo on this post is added with this feature, plus a filter I added to my theme’s functions.php file.
I'm running Athualpa 3.4.4 theme.