Google has a new 3D 'immersive world' offering called Lively. It allows you to move around as an avatar in 3D spaces called 'rooms', where you can interact with people, chat and generally be three dimensional and immersive.
Where Lively possibly gets interesting is that it combines streams of Google-related stuff: you can watch YouTube videos or view Picasa images within the Lively environment, as well as embed desktop gadgets and post Lively rooms to your blog. The 3D immersive experience, in short, crosses a number of boundaries with reality and gives some possibly interesting new ways for people to access and use content - including music.
It's currently in Beta, but there's a long way to go. Lively crashes Firefox repeatedly, suffers from awful lag and appears to be, well, lacking a point. You'll need to download the (free, of course) Lively client browser plug-in.
And there endeth the Geek post...