I'm getting errors trying to mount my old iPod mini.  It worked perfectly in Gutsy.  I wiped out Gutsy and did a fresh install of Heron - running Gnome.  I usually use hipo.
here is the tail of dmesg
[ 6405.923086] usb 5-5: new high speed USB device using ehci_hcd and address 8
[ 6406.055893] usb 5-5: configuration #1 chosen from 1 choice
[ 6406.083058] scsi7 : SCSI emulation for USB Mass Storage devices
[ 6406.091121] usb-storage: device found at 8
[ 6406.091128] usb-storage: waiting for device to settle before scanning
[ 6411.081569] usb-storage: device scan complete
[ 6411.082443] scsi 7:0:0:0: Direct-Access     Apple    iPod             1.62 PQ: 0 ANSI: 0
[ 6411.086513] sd 7:0:0:0: [sdb] 12000555 512-byte hardware sectors (6144 MB)
[ 6411.087755] sd 7:0:0:0: [sdb] Write Protect is off
[ 6411.087760] sd 7:0:0:0: [sdb] Mode Sense: 64 00 00 08
[ 6411.087762] sd 7:0:0:0: [sdb] Assuming drive cache: write through
[ 6411.089747] sd 7:0:0:0: [sdb] 12000555 512-byte hardware sectors (6144 MB)
[ 6411.090619] sd 7:0:0:0: [sdb] Write Protect is off
[ 6411.090624] sd 7:0:0:0: [sdb] Mode Sense: 64 00 00 08
[ 6411.090626] sd 7:0:0:0: [sdb] Assuming drive cache: write through
[ 6411.090632]  sdb: [mac] sdb1 sdb2 sdb3
[ 6411.334400] sd 7:0:0:0: [sdb] Attached SCSI removable disk
[ 6411.334473] sd 7:0:0:0: Attached scsi generic sg2 type 0
[ 6411.644171] usb 5-5: reset high speed USB device using ehci_hcd and address 8
[ 6441.830585] usb 5-5: reset high speed USB device using ehci_hcd and address 8

It shows up under Nautilus but cannot be opened.  The error is: Unable to mount location  no media in drive.
dmesg now shows:
[ 6452.055054] usb 5-5: reset high speed USB device using ehci_hcd and address 8
[ 6468.367920] usb 5-5: reset high speed USB device using ehci_hcd and address 8
[ 6468.615446] usb 5-5: reset high speed USB device using ehci_hcd and address 8
[ 6478.839946] usb 5-5: reset high speed USB device using ehci_hcd and address 8
[ 6478.972775] sd 7:0:0:0: Device offlined - not ready after error recovery
[ 6478.972798] sd 7:0:0:0: [sdb] Result: hostbyte=DID_ABORT driverbyte=DRIVER_OK,SUGGEST_OK
[ 6478.972804] end_request: I/O error, dev sdb, sector 12000545
[ 6478.972808] printk: 53 messages suppressed.
[ 6478.972812] Buffer I/O error on device sdb, logical block 12000545
[ 6478.972819] Buffer I/O error on device sdb, logical block 12000546
[ 6478.972822] Buffer I/O error on device sdb, logical block 12000547
[ 6478.972825] Buffer I/O error on device sdb, logical block 12000548
[ 6478.972828] Buffer I/O error on device sdb, logical block 12000549
[ 6478.972831] Buffer I/O error on device sdb, logical block 12000550
[ 6478.972835] Buffer I/O error on device sdb, logical block 12000551
[ 6478.973738] sd 7:0:0:0: rejecting I/O to offline device
[ 6478.973743] Buffer I/O error on device sdb, logical block 12000545
[ 6478.973747] Buffer I/O error on device sdb, logical block 12000546
[ 6478.973750] Buffer I/O error on device sdb, logical block 12000547
[ 6478.974590] sd 7:0:0:0: rejecting I/O to offline device
[ 6478.974599] sd 7:0:0:0: rejecting I/O to offline device
[ 6478.974605] sd 7:0:0:0: rejecting I/O to offline device
[ 6478.974611] sd 7:0:0:0: rejecting I/O to offline device
[ 6478.974617] sd 7:0:0:0: rejecting I/O to offline device