Photosynth, a new development from Microsoft is available as a technology preview. As far as I can tell this is a sort-of “proof that we’re really doing this” release, which lets you navigate around pre-built images. Unfortunately you can’t add your own: that’s going to need a lotof computer oomph apparently.
Also, unfortunately I can’t load it on my laptop; it doesn’t have a D3D-capable card. I’ll have to wait until I get home before I try this.
Still, this looks like a very interesting program and I’m looking forward to putting my billions of miscellaneous photos on it.