PlugPlayer really is a great app!
I've got my own perfect home-entertainment-system (independent from any itunes an frustrating syncing between devices) using a windows server with a upnp-shared wmp library where i can access all my media from any pc or iphone. i can output the media on any pc, the iphone itself or on an wlan-connected WD TV Live HD (even video, which i really can reccomend, costs less than 100 €) or any other upnp renderer.
the only thing i miss is that i am not able to get video-files played on plugplayer although i've tried severals files/codecs/formats. it would be a great feature to make PlugPlayer video playable. I even would pay some more money for this app!
regards, ND