Unfortunately, PS3 as UPnP client kinda sux.
I hate clients that won't continue to play current track and simultaneously let you browse. The minute you go back in the menu..playback stops.
Incidentally, I tried using Vista WMP 11 Media Center, and PS3 finds it, but I could not get it to display any trax.
I also run a mt-daapd server which works nice for iTunes, and Roku, but not DLNA, so no go on PS3.
Am planning on trying the other servers that are available.