Concept:
Utilizing Custom Fields – Create a system that allows one to mark a “Problem” as “Solved” a “Course” as “Completed” a “Book” as “Read” etc.
Adding this Custom Field to a post will call an Image or Add Text with CSS to appear next or near the Post in all archive, post and category pages.
Initial Help Sources:
http://codex.wordpress.org/Using_Custom_Fields_to_attach_images,_links_or_files_to_a_post_easily
Find Gig where I created a similar system for a Wine Theme