Short time ago Nokia Beta Labs have released the first official build (and in testing phase) of Play To. Play To already seen on Symbian is an app that allows the share photos and video of the phone via WLAN with DLNA-compatible devices.
NokiaLabs have announced that in future releases will integrate the functions of streaming audio and DLNA Media Server.
For now, if you're interested, find all the information on Nokia Betalabs.