! This Add-On will delete all non-sync-files and sub-folders in the selected folder! (thanks to GeekShadow for this hint)
You can find it in the bottom Pane and since 1.5 also in the Sidebar. (thanks to luffedelly telling that it is not that easy to find)
Here a short description, if you need additional information, click at the picture to go to the FolderSync Manual:

This Add-On provides a DisplayPane, wich has got the opportunity to sync playlists with a folder.
This Add-On is able to sync with every folder you can specify with an absolute path. So you can for example sync with USB-Mass-Storage-Devices.
Features:
Version 0.1
Sync playlists to Folders
Remember last path
Progressbar
Version 0.2
Sync more than one playlist to one folder
Version 0.3
Remember more than one path
Version 0.4
Batch-processing many folders
Version 1.0
Options Dialog
Write Playlists
Auto-format filenames and auto-create folders
Version 1.3
Option to disable deleting
Track Number with leading zero(s)
Filenames with %playlist%
Version 1.4
Apply most preferences without re-opening the pane
Checking for existing files by change-date too
Better m3u files (preferences for filename-formatting)
Option for deactivating FileChange-Control
More Tags for auto-format (%albumartist%, %year%)
Version 1.5
Interface Redesign(Also support right Pane, some more UI-Preferences like Preference-Button, etc.)
Version 2.0
Sync Profiles
Version 2.1
Cancel Sync
Version 2.2
Space required preview
Version 2.3
Write Cover-Image to %album% (or any other) folder
Write M3U to other folder(s)
Will come in future releases:
Without version
Options to modify play count and last played date at sync. (Maybe in an other, new addon)
Known Bugs
At some machines with Windows Vista the Add-On needs administrative privileges.
(thanks to Archaos for this hint)
If the Add-On doesn't work at your machine, please post here!
If you like the Add-On you might translate it into your language:
Click here to go to Babelzilla.org
If somebody want to code some features' implementation, write a comment and/or write a eMail!
Please post a comment and/or rate, don't be afraid posting bugs and ideas!
hannes_riehl
perfect!
finally I can sync my mp3-player with songbird.
just one thing I noticed:
you can not sync with the root folder of a device.
you have to create a folder.
Hannes