Just downloaded and installed latest version of Philips Media Manager 3.3.12.004 in the interests of seeing how well it performs with Media Streamer and my Philips SL300i UPnP AV Media player. (Media Streamer 1.0.8.2 installed on Nokia 770)

With PMM the media art when available is transferred to the Nokia's Media Streamer interface i.e.



Just thought some of you may be interested, I think that you will need to be careful on the size of the thumbnails on the home PC as a couple of times the transfer of the image caused the Nokia 770 to lose its Wi-Fi connection temporarily.

You can find latest version of PMM for WINDOWS Here

I really don't know which other UPnP Media Servers have this option and even if its a pure UPnP Feature. (I.e. Nokia worked with SimpleCenter/PMM team to ensure Nokia 770 Media Streamer is maximised with their Media Server)