I know there's feature to show who's currently reading a thread and etc. But would be nice to have plugin that stores all those users that have read a thread, blog article, gallery image(s), etc. Once user views thread, blog article, or gallery image(s), it displays their name under that thread, blog article, gallery image(s) permanently or for specific time-frame of your choosing. This helps thread authors, blog article authors, and gallery image uploader an idea of who all read and viewed their material. It's also interesting to see who seen your stuff.