From its website: Cover Thumbnailer is a small Python script which displays music album's covers and a preview of pictures which are in a folder in Nautilus, the GNOME's file browser. Cover Thumbnailer generates the folder's thumbnail automatically, like any other thumbnailer; you don't have to generate thumbnails manually.
Version 0.8.3 of Cover Thumbnailer was released just recently, with support for Nautilus 3.x.
Cover Thumbnailer is a small Python script which displays music albums covers and a preview of pictures which are in a folder in nautilus, the GNOMEs file browser. Cover Thumbnailer generate the folders thumbnail automatically, like any other thumbnailer ; you dont have to generate thumbnails manually.
Cover Thumbnailer 0.8.3 works with Nautilus 3.x
Cover Thumbnailer 0.8.2 and previous work with Nautilus 2.x
Using the PPA bellow, the latest version (0.8.3 at the time of writing) will be installed, which is compatible with nautiluss current version in Xubuntu 11.10/12.04.
Cover thumbnailer should start working automatically after installation (by default it creates thumbnails for the ~/Pictures and ~/Music directories). It has a GUI for settings configuration which can be accessed via Applications Menu > Settings > Cover Thumbnailer or typing the command: cover-thumbnailer-gui.