Sometimes small features make the difference. A few minutes ago I recognized a new context menu entry on music files stored on my Notebook:

If you click it, a small player opens which allows you to control a Universal Plug and Play (UPnP) media device. In this cases it’s my Roku Soundbridge network MP3 player which Windows discovered automatically. The player looks like this:

(click to enlarge)

Windows Vista already could stream media to UPnP devices, but there was no means to control such devices. Windows 7 now can.