[Tybalt39]

I have used Pocket Tunes for a couple of years on multiple devices. It is intended for QVGA, but there is one WVGA skin. It was more finger-friendly with QVGA skins, but I hold out hope for more skins as WVGA becomes more common. IIRC, it uses the tags rather than file structure for organization. At least, my audiobooks are listed by either genre, artist, or title; depending on how I select. Additionally, Pocket Tunes handles m4b format properly (bookmarks and so forth). There is also equalization capability with pre-sets. The latest version syncs with iTunes (if you need that).

It works with bluetooth (track advance/rewind, pause/play). Software volume control seems to not work with my headset (Plantronics Voyager 855), but the internal volume control on the headset works just fine. I can launch Pocket Tunes with Voice Command, but I have not been able to launch individual m4b audiobooks with Voice Command.