I ran

rhythmbox -d file:///media/SANSA%20CLIP 2> rhythmbox.log

with the Sansa mounted and have attached the output, as well as the output from lshal below.  From rhythmbox.log it appears that rhythmbox thinks my Sansa Clip is a Nokia 770???  Below is the pertinent section:

from rhythmbox.log:
---------------
(15:31:03) [0x81fc408] [dump_volume_identifiers] rb-removable-media-manager.c:555: unix-device = /dev/sdb
(15:31:03) [0x81fc408] [dump_volume_identifiers] rb-removable-media-manager.c:555: hal-udi = /org/freedesktop/Hal/devices/volume_uuid_F43C_C817
(15:31:03) [0x81fc408] [dump_volume_identifiers] rb-removable-media-manager.c:555: uuid = F43C-C817
(15:31:03) [0x81fc408] [dump_volume_identifiers] rb-removable-media-manager.c:555: label = SANSA CLIP
(15:31:03) [0x81fc408] [rb_removable_media_manager_add_volume] rb-removable-media-manager.c:593: Unhandled media
(15:31:03) [0x81fc408] [dump_volume_identifiers] rb-removable-media-manager.c:555: unix-device = /dev/sdb
(15:31:03) [0x81fc408] [dump_volume_identifiers] rb-removable-media-manager.c:555: hal-udi = /org/freedesktop/Hal/devices/volume_uuid_F43C_C817
(15:31:03) [0x81fc408] [dump_volume_identifiers] rb-removable-media-manager.c:555: uuid = F43C-C817
(15:31:03) [0x81fc408] [dump_volume_identifiers] rb-removable-media-manager.c:555: label = SANSA CLIP
(15:31:03) [0x81fc408] [hal_udi_is_nokia770] rb-nokia770-source.c:179: Nokia detection: info.parent=/org/freedesktop/Hal/devices/storage_serial_SanDisk_Sansa_Clip_4GB_ED0FFF0E3904B5870000000000000000_0_0
(15:31:03) [0x81fc408] [hal_udi_is_nokia770] rb-nokia770-source.c:184: Nokia detection: info.vendor=SanDisk
(15:31:03) [0x81fc408] [get_hal_udi_for_player] rb-generic-player-source.c:1356: searching for player udi from /org/freedesktop/Hal/devices/volume_uuid_F43C_C817
(15:31:03) [0x81fc408] [get_hal_udi_for_player] rb-generic-player-source.c:1365: parent of udi /org/freedesktop/Hal/devices/volume_uuid_F43C_C817: /org/freedesktop/Hal/devices/storage_serial_SanDisk_Sansa_Clip_4GB_ED0FFF0E3904B5870000000000000000_0_0
(15:31:03) [0x81fc408] [rb_generic_player_is_mount_player] rb-generic-player-source.c:829: Checking udi /org/freedesktop/Hal/devices/storage_serial_SanDisk_Sansa_Clip_4GB_ED0FFF0E3904B5870000000000000000_0_0
(15:31:03) [0x81fc408] [rb_generic_player_is_mount_player] rb-generic-player-source.c:837: device cannot be accessed via storage
(15:31:03) [0x81fc408] [free_dbus_error] rb-generic-player-source.c:1395: checking device access method: dbus error: No property portable_audio_player.access_method on device with id /org/freedesktop/Hal/devices/storage_serial_SanDisk_Sansa_Clip_4GB_ED0FFF0E3904B5870000000000000000_0_0
(15:31:03) [0x81fc408] [rb_removable_media_manager_add_mount] rb-removable-media-manager.c:654: Unhandled media
(15:31:03) [0x81fc408] [load_uri_args] main.c:368: examining argument file:///media/SANSA%20CLIP
(15:31:03) [0x81fc408] [local_load_uri] main.c:422: Using load_uri for file:///media/SANSA%20CLIP
(15:31:03) [0x81fc408] [rb_uri_could_be_podcast] rb-file-helpers.c:341: 'file:///media/SANSA%20CLIP' can't be a Podcast or OPML file, not the right scheme
(15:31:03) [0x81fc408] [rb_shell_load_uri] rb-shell.c:3329: adding uri file:///media/SANSA%20CLIP, play 1
(15:31:03) [0x81fc408] [rb_shell_guess_source_for_uri] rb-shell.c:3214: source Play Queue returned strength 25 for uri file:///media/SANSA%20CLIP
(15:31:03) [0x81fc408] [rb_shell_guess_source_for_uri] rb-shell.c:3214: source Music returned strength 50 for uri file:///media/SANSA%20CLIP
(15:31:03) [0x81fc408] [rb_shell_load_uri] rb-shell.c:3367: file:///media/SANSA%20CLIP doesn't have a source, adding
(15:31:03) [0x81fc408] [rb_shell_guess_source_for_uri] rb-shell.c:3214: source Play Queue returned strength 25 for uri file:///media/SANSA%20CLIP
(15:31:03) [0x81fc408] [rb_shell_guess_source_for_uri] rb-shell.c:3214: source Music returned strength 50 for uri file:///media/SANSA%20CLIP
(15:31:03) [0x81fc408] [impl_add_uri] rb-library-source.c:1285: adding uri file:///media/SANSA%20CLIP to library
(15:31:03) [0x81fc408] [rhythmdb_add_uri_with_types] rhythmdb.c:2850: queueing stat for "file:///media/SANSA%20CLIP"
------------------