This plugin shows the image and the title of the book you are currently reading in the sidebar. The plugin gets this information from your Bookwormr reading list. Bookwormr is a completely free service where book lovers can list the books they are reading, have read and would like to read. Users can also write reviews and give each book a score. If you are reading more than one book the plugin randomly chooses a different book to display on each page request.
Tested on WordPress 2.7.1 and stable.