Already said, but I would really like to emphasize the need for the DLNA server to support more video formats, in particular high definition ones, like MKV. I would have never bought this unit if I had known of this limitation.
Also, the DLNA server should be capable of processing subtitles (.srt) files automatically, just like Samsung's PC Share Manager does. That is, to show subtitles automatically is a .srt file with the same name as the video file is present in the same folder.
Also, I don’t know is there is a good reason for using custom disk format, but I would really like that the DNS would use NTFS, so the user could eventually move the HD to a desktop or other USB box and use the data without reformating. That would also eliminate those silly compatibility problems between products.
Compatibility with Intel's Matrix technology would also be welcomed.