Hi abramsh,
Do you have any plans to implement transcoding for non-natively supported video formats yet? There have been a number of apps that can play other types of video files for some time now, and some of your UPNP-enabled competitors have added the feature (e.g. Airplayer).
I don't think I'd switch to another media player - I still think you did UPNP support first and best - but it would be nice to know if you have any plans to add transcoding for the faster iOS devices (3GS+).