Folder Player Pro is  a directory - centric music\mp3 player and is a more advanced version of its free counterpart. 
It adds the following capabilities on top of free version:

 -  Priority updates
 -  Unlimited tagging, allowing you to create multiple "playlists"
 -  Extended cross-fading functionality
 -  Ability to auto-delete tracks during playback
 -  Option to stop on power loss
 -  Option to continue playback for next folder, after current folder finishes
 - M3U support


Some of the other features shared between two editions:

- playing folder trees AND individual files within folders
- integration with Bluetooth headphones (and your car)
- integration with last.fm (via scrobbler)
- pauses during phone calls and navigation speech
- sequential and random play
- configurable settings
- Equalizer 
- Double press headset button to skip track
- Search

Please visit http://folderplayer.com for feedback on problems\ideas\suggestions