Having recently replaced my PS3 by a WDTV Live (I love that custom firmware too!), I would certainly second that idea
Also, I saw that a different UPNP server was able to determine what type of media the WDTV Live was requesting (video, audio or photo), and it would automatically show only the appropriate top folders, while Mezzmo shows you all three types before actually showing you the appropriate playlists. I guess that means the WDTV Live has the ability to specify the content type in its request - any chance Mezzmo could use that information? It would be one less folder level to navigate through.
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