I have tried playing a few movies (transcoded DVDs) and I have noticed that after a few minutes, the playback suddenly stops. I play the same files in standalone mplayer and this behavior does not occur. This is the only bug I've noticed, a few other comments are listed below for you to do with as you see fit.
When I'm in the music list and I add a track to the (empty) queue, it does not start playing. I need to navigate to the queue and start it playing there, which isn't what I expect. If that's the intended functionality, perhaps you could add another button for "play now in queue" sort of like iTunes has? A "play next in queue" function would also be nice down the road.
In the image viewer, is there a way to start a slideshow (i.e., automatically advance through images in the queue after a delay)? If not, this is not a high priority but it would be nice eventually. Another thing that would be nice is for the program to preload the next image in the queue so the transition is faster.
It is nice having the onscreen keyboard for searching but I find it a little nonintuitive. Let's say I am browsing music and I want to find a track with a particular name. I type the song name in but nothing happens unless I happen to have the tracklist for that particular album open. Is there some way around this?
Finally, while I like the "finger friendly" UI, sometimes it is nice to be able to navigate and start playing solely using the d-pad. Right now if I am browsing, the d-pad up and down buttons seem to be mapped to "flick up" and "flick down," while the center button does nothing. It would be nice if the buttons instead moved the "focus" from one item to the next/previous, and clicking the center button corresponded to "play." The left-right buttons could navigate between the list of items and the types of views ("by album" / "by artist" etc.)
Once again, great job, I really like how this app is coming along.