Thanks for this great and sleek app! I am planning to use it as a web-based media player for my personal flv and mp3 music collection.
I got some ideas what could make the app more simple to use for such purpose:
1) there should be possibility to automatically capture a random frame from video file (using fmpeg for example) and use that as a cover image for the video
2) there should be a batch import possibility - it would be nice to be able to select a whole directory of files and upload them all at once. Then user could be redirected to a list view where he would have all the id3-tag information prefilled into forms and could correct/change those and then finally save it all.
3) when inserting tags for media, there could appear a kind of a dropdown in del.icio.us style
