The original disk mount panel applet. This is the same as the disk mounter included through GNOME 2.8. For GNOME 2.10 the official applet was rewritten, the new version adds the ability to autodetect mountable devices, but drops a significant (all) configurability. It no longer allows you to choose which devices are displayed on the panel, their order, or icon representation.
Install this applet if you want to restore the old disk mounter behavior for GNOME 2.10.