Whereas Thunar as well as the panel places plugin displayed an option for my floppy drive, it is gone since upgrading to Xfce 4.6.

The (I guess) relevant output of hal-device is the following:

---8<---
68: udi = '/org/freedesktop/Hal/devices/pnp_PNP0700'
  linux.hotplug_type = 2  (0x2)  (int)
  linux.subsystem = 'pnp'  (string)
  pnp.id = 'PNP0700'  (string)
  pnp.description = 'PC standard floppy disk controller'  (string)
  linux.sysfs_path = '/sys/devices/pnp0/00:05'  (string)
  info.parent = '/org/freedesktop/Hal/devices/computer'  (string)
  info.subsystem = 'pnp'  (string)
  info.product = 'PC standard floppy disk controller'  (string)
  info.udi = '/org/freedesktop/Hal/devices/pnp_PNP0700'  (string)
--->8---

Please ask for any more info you need.