Google yesterday released Google Media Server, a tiny application that runs in the background on users’ desktops to send their media files as well as Picasa photos and YouTube video to a TV via a “universal plug-and-play” device like the PlayStation 3.
You’ll need Windows, Google Desktop, and a UPnP-enabled device (for instance, a HP or Loewe television, a Roku SoundBridge, an Archos portable media player, or a PlayStation 3) to try it out, so this does require some tinkering. However, Google Media Server won’t work for the XBox 360 because apparently to link it up, Google would have had to say its server was made by Microsoft (at least according to someone from the Media Server team commenting in their forum).
Alternatives include Orb and TVersity, but they don’t connect directly to YouTube and Picasa (Update: TVersity does connect to YouTube, per the comments). On the web streaming front, YouTube has also been upping its game to get onto living room devices.