My old Omnifi DMP1 did this (sync from wireless enabled Linux-embedded hard drive-based media component for the car to PC) and required the installation of the Simplecenter application (included with the DMP1) to perform the library catalog work and did sync using uPnP. That app was so dog slow, being Java-based. Some other manufacturers licensed the program to give this functionality to their devices, including a small handful of Nokia phones. The desktop app went open source but seems to have fallen by the wayside in the past couple of years. I haven't kept up with the open source community and usergroups of the Omnifi products but they still exist in some capacity on Yahoo.

I have an original licensed copy of Simplecenter on CD and at least one other open source version downloaded. The newer versions performed better but IIRC caused some failure to see the other Omnifi product, the DMS1 (a network digital audio player). The older and last official commercial version (for the Omnifi products at least) still sits on the support server here: http://www.omnifimedia.com/scripts/o...ted=1077817126 but you can find the 4.2 open source version floating around on various download sites. As for the original source code itself, I can't say where it may be.

Simplecenter was of course able to serve up music as well to compatible uPnP devices, and some devices could control the output to the PC, including the N95 as seen here: http://gauravrathod.wordpress.com/20...me-media-tool/

I wanted to be able to redirect the output not to the PC, but my Omnifi DMS1 and thus use my tablet as a remote control in this fashion. I think the DMS1's implementation of uPnP fell far short of perfect and was lacking some needed bits of code.I know the community hacked together their own firmware for the DMP1, so I'm sure someone there knows something about synchrozing over wifi.

A related thread appears to be in play regarding Maemo 5 and uPnP: http://talk.maemo.org/showthread.php?t=32229

Perhaps some of our questions/requests could be made known to zeenix: http://zee-nix.blogspot.com/