I used to have a plugin that gave me more markup options in post (like <!--more-->). In specific it had something like <!--preview_only-->, which you could put content (like a avatar image) that would only show on the main page, but after you click "Read More", dissapears.
Point is, I use wordpress for cd reviews, and I would like on the frontpage to show all the excerpts (stuff béfore the <!--more--> tag) with a small coverart. When you click "read more", the small cover in the excerpt dissapears and only the text remains.
I know this plugin is available (I used it a while ago), but I cant seem to find it anywhere :S