It's been a while in the beta phase, but here is the final version of 1.6.0. The User Guide will be updated soon.

One point to note: Be sure to turn off 'Play on import' in iTunes advanced settings, as this adversely affects performance when tracks are converted to MP3 or AAC during the sync.

1. Added selectable minimum bitrate when re-encoding files that are the same format as the selected encoder: iTunes tracks with bitrates below the setting will not be re-encoded
   
2. Checks for file existance at the destination before any conversion happens
   
3. Added option to use ID3 name tag as the destination filename (+ extension)
   
4. Illegal/accented characters from track filename now removed when syncing tracks
   
5. Converted track names now same as original file, after illegal/accented characters removed
   
6. Added option to use a single folder for artist/albums instead of the normal folder/subfolder hierarchy
   
7. M3U playlists now list tracks in same order as the iTunes playlist
   
8. Now supports reverse order syncing of the playlist tracks.
   
9. If playlist subfolder is set to be the same as iTunes playlist name, M3U playlists no longer have the 'ST-[dest folder]-' prefix.
   
10. Simple Mode now supports the use of a named folder in the top-level as well as the destination volume's top-level.
    
11. Changed M3U behaviour: 3 M3U files are normally created, if all files are MP3 or AAC, previously, SyncTunes would retain the M3U with MP3/AAC suffix. Now the M3U with no suffix is retained and the MP3/AAC M3U are deleted. This helps when using iTunes playlist name.
    
12. MP3 and AAC Track filenames with no extension now have .mp3 and .m4a, respectively, added to the synced destination filename
    
13. Added #M3UTITLE in extended format M3U playlists. Uses the iTunes playlist as the M3U title or the 'artist - album'
    
14. Invisibles erased during sync - just incase SyncTunes is not used to eject the volume
    
15. Various 'under-the-hood' changes
    
16. Profiles need to be resaved with v1.6.0
    
17. Bug fix: Quicktime files, such as OGG, in iTunes v5 do not report a bit rate. When converting file format, the file will be converted.
    
18. Bug fix: When an error occurs copying a track, now deletes any partially copied file and tries again. If a second error occurs the partially copied file is deleted and the track is skipped
    
19. Bug fix: Loading profiles on Intel Macs no longer rejected as the wrong file format
    
20. Bug fix: Now syncs files when running on Intel Macs instead of skipping over each track

[Update: the User Guide has now been updated with the new features]