Hey,
It'd be great if the preview page could be made to look like the final post will. I don't mean with all the headers etc (although that may be good, I don't know, I'd have to see), but rather with the proper background. On the preview page, the message text is displayed on the light color while when other users read the post it's displayed on the dark color.
Minor, but it's nice to see how it'll really look and the color of the background makes a big difference.
[ADMIN NOTE: THIS FEATURED HAS BEEN ADDED]